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GB 17378.4-2007: The specification for marine monitoring -- Part 4: Seawater analysis
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Basic data | Standard ID | GB 17378.4-2007 (GB17378.4-2007) | | Description (Translated English) | The specification for marine monitoring -- Part 4: Seawater analysis | | Sector / Industry | National Standard | | Classification of Chinese Standard | A45 | | Classification of International Standard | 07.060 | | Word Count Estimation | 170,154 | | Date of Issue | 2007-10-18 | | Date of Implementation | 2008-05-01 | | Older Standard (superseded by this standard) | GB 17378.4-1998 | | Quoted Standard | GB/T 12763.2; GB/T 12763.4; GB 17378.2; GB 17378.3; HY/T 07-1992 | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 12 of 2007 (total 112) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Chinese standard applies to analysis of the water monitoring project method, seawater analysis sample collection, storage, transport, computing, measurement results presented technical regulations and requirements. This standard applies to the ocean, coastal, estuarine and brackish waters. Can be used for marine environmental monitoring, routine water quality monitoring, shallow waters pollution survey and monitoring, and ocean dumping, dredged material, red tides and marine pollution incidents | GB 17378.4-2007: The specification for marine monitoring -- Part 4: Seawater analysis---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
The specification for marine monitoring.Part 4. Seawater analysis
ICS 07.060
A45
National Standards of People's Republic of China
Replacing GB 17378.4-1998
Marine monitoring
Part 4. Seawater Analysis
Posted 2007-10-18
2008-05-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Introduction Ⅴ
1 Scope 1
2 Normative references 1
3 Terms and definitions
4 1 General Provisions
Mercury 2 5
5.1 Atomic Fluorescence Spectrometry 2
5.2 Cold atomic absorption spectrophotometry 4
5.3 Gold trapping Cold Atomic Absorption Spectrometry 6
6 10 Copper
6.1 flameless atomic absorption spectrophotometry (continuous determination of copper, lead and cadmium) 10
6.2 anodic stripping voltammetry (Continuous determination of copper, lead and cadmium) 12
6.3 Flame Atomic Absorption Spectrometry 13
7 lead 15
7.1 flameless atomic absorption spectrophotometry 15
15 7.2 anodic stripping voltammetry
7.3 Flame Atomic Absorption Spectrometry 15
8 Cd 17
8.1 flameless atomic absorption spectrophotometry 17
17 8.2 anodic stripping voltammetry
8.3 Flame Atomic Absorption Spectrometry 17
9 Zinc 19
9.1 Flame Atomic Absorption Spectrometry 19
21 9.2 anodic stripping voltammetry
10 Total chromium 22
10.1 flameless atomic absorption spectrophotometry 22
10.2 diphenyl hydrazine spectrophotometry 24
Arsenic 11 26
11.1 Atomic Fluorescence Spectrometry 26
11.2 arsine - Spectrophotometry 28 silver nitrate
11.3 hydride generation atomic absorption spectrophotometry 30
11.4 catalytic polarography 32
12 Selenium 35
12.1 fluorospectrophotometry 35
12.2 diaminobenzidine spectrophotometry 37
12.3 catalytic polarography 39
13 42 Oil
13.1 fluorospectrophotometry 42
13.2 UV spectrophotometry 44
13.3 gravimetric method 45
14 666, DDT --- Gas Chromatography 47
PCBs 15 50 --- Gas Chromatography
16 Dieldrin --- GC 54
17 57 active silicate
17.1 silicon molybdenum yellow 57
17.2 silicon-molybdenum blue method 59
Sulphides 18 60
18.1 60 Methylene blue spectrophotometric method
18.2 Ion Selective Electrode 64
19 --- 4-amino-phenol volatile antipyrine spectrophotometric method 67
20 Cyanide 70
20.1 isonicotinic acid - pyrazolone spectrophotometric method 70
20.2 Pyridine - barbituric acid spectrophotometric 73
Colorimetric color --- 75 21
22 Transparency --- transparent disk Act 76
23 anionic detergent --- Methylene blue spectrophotometric method 76
24 --- taste and olfactory senses Act 78
Water temperature 79 25
25.1 SST table method 79
25.2 reversed thermometer method 80
26 pH-pH meter method 83
27 suspension --- gravimetric method 88
28 --- silver chloride titration 91
29 Salinity 92
29.1 salinometer Act 92
29.2 thermohaline deep instrument (CTD) Act 95
Turbidity 95 30
30.1 turbidity meter method 95
30.2 Visible turbidimetric method 96
98 30.3 spectrophotometry
DO 99 31 --- Iodimetry
32 --- alkaline potassium permanganate COD 101
33 BOD 103
33.1 five days incubation (BOD5) 105
33.2 two-day culture (BOD2) 103
TOC 34 105
105 34.1 Total Organic Carbon Instruments Act
34.2 persulfate oxidation method 107
35 109 inorganic nitrogen
36 109 ammonia
36.1 indophenol blue spectrophotometry 109
36.2 hypobromite oxidation 111
37 nitrite --- naphthylethylenediamine spectrophotometry 113
38 Nitrate 115
38.1 Cadmium Reduction Method 115
38.2 zinc - cadmium reduction method 117
39 117 inorganic phosphorus
39.1 Phosphorus Molybdenum Blue spectrophotometry 117
39.2 Extraction of phosphorus molybdenum blue spectrophotometric method 119
40 TP --- persulfate oxidation method 120
41 TN --- persulfate oxidation method 121
42 Ni --- flameless atomic absorption spectrophotometry 121
Appendix A (normative) record table 123
Appendix B (normative) water sample collection, storage and transport 156
Annex C (informative) limit of detection 160
Preparation of Annex D (informative) working copy standard seawater 162
Figure 1 cold vapor atomic absorption mercury means 5
Figure 2 gold cold vapor atomic absorption mercury trapping device 8
Figure 3 arsine generation - absorbing means 29
4 alkaline hydrolysis reflux device 52
Figure 5 hydrogen sulfide aerator 63
6 surface water temperature gauge 79
Figure 7 Determination of suspended solids operational processes 89
8 89 filtration system
Carbon dioxide measurement device 108 in FIG. 9
Table 2 olfactory and taste intensity level 78
Table 3 Main specifications of the primary and secondary temperature 80
Table 4 counter correction value (α) table (linked to water sampling Used) 81
Table of pH 5 0 ℃ ~ 45 ℃ standard buffer material 85
Table 7 pH measured pressure correction coefficient β Table 86
Table 8 pH ~ αH + conversion table 87
Table 9 Salt error correction coefficient table 111
Table A. 1 Sample Analysis Quality Standards (work) curve data record (atomic fluorescence spectrometry) 123
Table A. 2 Water sample analysis records (atomic fluorescence spectrometry) 124
Table A. 3 Water sample analysis standard (work) curve data record (spectrophotometry) 125
Table A. 4 Water sample analysis records (spectrophotometry) 126
Table A. 5 Water sample analysis standard (work) curve data record (flameless atomic absorption spectrophotometry) 127
Table A. 6 Water sample analysis records (flameless atomic absorption spectrophotometry) 128
Table A. 7 Water sample analysis records (anodic stripping voltammetry) 129
Table A. 8 Water sample analysis standard (work) curve data record (atomic absorption spectrophotometry) 130
Table A. 9 Water sample standard (work) curve data record (Polarography) 131
Table A. 10 Water sample analysis records (Polarography) 132
Table A. 11 Water sample analysis standard (work) curve data recording (fluorescence spectroscopy) 133
Table A. 12 Water sample analysis recording (fluorescence spectroscopy) 134
Table A. Water sample analysis 13 Oil Record (gravimetric method) 135
Table A. 14 water quality samples 666, DDT, dieldrin analysis records (GC) 136
Table A. Water samples were analyzed PCB 15 records (GC) 137
Table A. 16 Water samples Nutrient analysis records (spectrophotometry) 138
Table A. 17 Water sample analysis of sulfide standard (work) curve data record (sulfide ion selective electrode) 139
Table A. 18 Water sample analysis records sulfide (sulfide ion selective electrode) 140
Table A. 19 observation surface thermometer record table 141
Table A. 20 temperature observation records table 142
Table A. 21 temperature observation record table 143
Table A. 22 pH measurement records (method) 144
Table A. 23 seawater suspended solids analysis records (gravimetric method) 145
Table A. 24 Water sample analysis records chloride (silver titration) 146
Table A. 25 Water salinity measurement sample record (salinity meter method) 147
Table A. 26 Water samples analyzed turbidity standard curve data records (law) 148
Table A. 27 Water sample turbidity measurement record (method) 149
Table A. 28 Dissolved Oxygen Water Sample Analysis Record (iodometry) 150
Table A. 29 water samples COD analysis records (alkaline potassium permanganate) 151
Table A. 305, the biochemical oxygen demand analysis records (5th 20 ℃ culture) 152
Table A. Analysis of total organic carbon in seawater 31 record (instrument method) 153
Table A. 32 marine environmental monitoring water quality report 154
Table A. 33 water samples sampling records 155
Table B. 1 Water sampler volume and save 156
Table C. Determination of the detection limit of 1 160
Foreword
All technical content in this section is mandatory.
GB 17378 "marine monitoring" is divided into seven parts.
--- Part 1. General;
--- Part 2. Data processing and analysis of quality control;
--- Part 3. Sample collection, storage and transport;
--- Part 4. Seawater analysis;
--- Part 5. Sediment analysis;
--- Part 6. Analysis of the organism;
--- Part 7. Ecological survey of offshore pollution and biological monitoring.
This section GB Part of 417,378, instead of GB 17378.4-1998 "specification for marine monitoring Part 4. Seawater Analysis."
This section compared with GB 17378.4-1998 main changes are as follows.
--- Water sample collection, storage and transport adjusted normative appendix (1998 Version 4.3; edition of Appendix B);
--- The detection limit adjustment is an informative annex (1998 edition Chapter 5; edition Appendix C);
--- Increased mercury atomic fluorescence assay (see 5.1);
--- Canceled mercury dithizone spectrophotometry (1998 edition 6.2);
--- Modified flameless atomic copper, lead and cadmium absorption spectrophotometry, adjusted to copper, lead and cadmium continuous assay (1998
Edition of 7.1,8.1,9.1; this edition 6.1,7.1,8.1);
--- Canceled copper diethyldithiocarbamate sodium spectrophotometry (1998 Version 7.4);
--- Canceled the lead dithizone spectrophotometry (1998 edition 8.4);
--- Canceled cadmium dithizone spectrophotometry (1998 edition 9.4);
--- Canceled zinc dithizone spectrophotometry (1998 edition 10.3);
--- Increased arsenic atomic fluorescence assay (see 11.1);
--- Cyclohexane modified oils extracted fluorescence spectrophotometry (1998 edition 14.1; 13.1 edition);
--- Canceled Freon - cyclohexane extraction system fluorescence spectrophotometry (1998 edition 14.2);
Modify the visual method is transparency - - --- transparency transparent disk Act (the 1998 edition 23.1; 22 edition);
--- Canceled pH of pH colorimetric (1998 edition 27.2);
--- Increasing the salinity of the thermohaline deep instrument (CTD) assay (see 29.2);
--- Increased TOC TOC instrument assay (see 34.1);
--- Increased TP persulfate oxidation assay (see Chapter 40);
--- Increasing the total nitrogen persulfate oxidation assay (see Chapter 41);
--- Increased nickel flameless atomic absorption spectrophotometry (see Chapter 42);
--- Appendix A revised and improved and adjusted to the normative appendix (Appendix A of the 1998 edition; edition of Appendix A);
--- Appendix B is an informative annex Adjustment (1998 edition Appendix B; this edition of Appendix D).
This part of the Appendix A and Appendix B are normative appendices, Appendices C and D are informative appendices.
This part by the State Oceanic Administration.
This part of the National Standardization Technical Commission for Oceanography (SAC/TC283) centralized.
This section drafted by. National Marine Environmental Monitoring Center.
The main drafters of this section. mountain - foot plain, Xuheng Zhen, Yu Tao, He Guangkai, Zhaoyun Ying, Zhang Guoguang, Shang Longsheng, Sun Qian, Wu Qing, Chen Shumei,
Han Dragon, Guan Tao Ming Ong Jian Guo, Zhang Chunming, Xukun Can, Chen Weiyue, Chen Banglong war Xiuwen.
This part of the standard replaces the previous editions are.
--- GB 17378.4-1998.
Marine monitoring
Part 4. Seawater Analysis
1 Scope
GB 17378 of the provisions of this part of the analysis of the water monitoring program for the analysis of sea water sample collection, storage, transportation, measurement results
If the calculation proposed technical regulations and requirements.
This section applies to oceans, coastal waters, estuaries and brackish waters mixed. It can be used for marine environmental monitoring, water quality monitoring routine, nearshore shallow waters
Environmental pollution investigation and monitoring, as well as marine dumping, dredged material, red tides and marine pollution accident emergency monitoring and special investigations related to the sea ocean
Marine environment investigation and monitoring.
2 Normative references
The following documents contain provisions which, through reference in this Part of GB 17378, constitute provisions of this part. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
GB/T 12763.2 specification for oceanographic survey - Part 2. Marine hydrographic observations
GB/T 12763.4 specification for oceanographic survey - Part 4. Chemical elements Marine Survey
GB 17378.2 specification for marine monitoring Part 2. Data processing and quality control analysis
GB 17378.3 specification for marine monitoring Part 3. Sample collection, storage and transportation
HY/T 07-1992 reversed thermometer
3 Terms and Definitions
The following terms and definitions apply to this part of GB 17378.
3.1
Using 0.45μm fiber membrane filter water.
3.2
Metering vessel volume mark.
4 General Provisions
4.1 reagents, solvents, membrane purification and treatment
4.1.1 ammonia isothermal diffusion method Purification. each containing ammonia and high water on the glass container division dryer separator or lower deck,
Closed place. Diffusion time depends on temperature may be about 1 week to 2 weeks.
4.1.2 chloroform, carbon tetrachloride purification. the opening of the new solvent can be a simple process that added 200mL of hydrochloric acid per liter of solvent
Hydroxylamine solution (0.5% volume fraction), shaking in a separatory funnel and washed aqueous phase was discarded, and washed with water once, dried over filter paper
Filter can be. If the recovery of waste as a solvent or after the above-described method of treatment is still not eligible, instead dismount treatment. Pour the solvent into the distillation flask to half
Full, plus the amount of sodium sulfite solution (10% volume fraction) overlying the upper right amount, for the first time distillation, then transferred to another clean retort
Added solid calcium oxide second distillation, the distillate was discarded early a little, then take distillate, stored in a brown bottle. If the solvent is chloroform, can be added
1% by volume of ethanol, to increase its stability.
4.1.3 0.45μm fiber membrane treatment. polyethylene film coated with stainless steel tweezers pinching the edge of the membrane, and one by one to a vertical downward dip
Hydrochloric acid solution into 0.5mol/L, at least 12h. Rinsed with pure water to neutral, sealed and set aside.
4.2 Description
4.2.1 standard blank (A0) and analysis of the blank (A Chou) deduction
Save Ab calibration curve read or search curve, but only the same batch feasible; if the blank value (A0 and Ab) is very stable and can be extended by one week.
Note 1. Aw. water sample absorbance (signal) value;
Note 2. Ab. Analysis Blank absorbance values;
Charles read the curve after Ab.
4.2.1.3 linear regression equation above provisions shall also be.
4.2.1.4 atomic absorption determination of gas chromatography, electrochemistry, with reference to the above provisions.
4.2.2 Error correction salt
Salt error (error caused by different ionic strength) correction, application of clean seawater dilution volume standard series; if using pure water should be given
Correction factor; known that certain correction factor (such as silicon, ammonia) subject to environmental impact and water fluctuations, the user should be based on measured results as necessary
Correction.
4.2.3 Water sample volume correction
When the amount of water samples taken before the sample is added to the aqueous reagent solution than 1% by volume, according to equation (1) Volume Correction.
Vp = Vp 1 Vp Vp 2 3 Vp 1+
(1)
Where.
After Vp --- correction water sample volume in milliliters (mL);
Vp 1 --- original water sample volume in milliliters (mL);
Take 3 --- Vp measured amount of water sample volume in milliliters (mL);
Vp 2 --- reagent was added solution volume, in milliliters (mL).
4.2.4 verification test methods
Water temperature, salinity, water color, transparency, pH, chloride, COD, ammonia hypobromite method is equivalent to using domestic and foreign-based test methods
Classical method, its performance most cited in the document, no further verification.
4.2.5 relative deviation limit between the parallel samples and natural samples spiked recoveries
Repeat to determine the relative deviation limit and natural recoveries were between parallel samples, if not specified in the original method, in accordance with
Implementation of the provisions of GB 17378.2.
5 Mercury
5.1 Atomic Fluorescence Spectrometry
5.1.1 Scope and Application
Suitable for ocean, coastal and estuarine area measuring mercury in seawater.
This method is a method of arbitration.
5.1.2 The principle of the method
Water samples by sulfuric acid - potassium persulfate digested, potassium borohydride reducing agent in the role of mercury ions are reduced to elemental mercury. With argon as a carrier
Gas mercury vapor atomic fluorescence spectrometer into the atomizer, with special mercury hollow cathode lamp as the excitation source, the determination of mercury atomic fluorescence
strength.
5.1.3 Reagents and preparation
5.1.3.1 Sulfate. technology ultrapure, ρ = 1.84g/mL.
5.1.3.2 Nitrate. excellent pure, ρ = 1.42g/mL.
5.1.3.3 hydroxylamine hydrochloride (NH2OH · HCl).
5.1.3.4 potassium persulfate (K2S2O8).
5.1.3.5 potassium borohydride (KBH4).
5.1.3.6 potassium hydroxide (KOH). pure class distinctions.
5.1.3.7 hydroxylamine hydrochloride solution (100g/L). Weigh 25g hydroxylamine hydrochloride (see 5.1.3.3) was dissolved in water and dilute to 250mL.
5.1.3.8 persulfate solution (50g/L). Weigh 50g of potassium persulfate (see 5.1.3.4) dissolved in water and diluted to 1000mL.
5.1.3.9 sulfuric acid solution. Under stirring, 28mL sulfuric acid (see 5.1.3.1) is slowly added 500mL of water, diluted
To 1000mL.
5.1.3.10 nitric acid solution (1 + 19). A 50mL nitric acid (see 5.1.3.2) slowly added to 1000mL water.
5.1.3.11 KBH4 solution (0.05g/L). Weigh 1g of potassium hydroxide (5.1.3.6 The) was dissolved in 200mL of water was added 0.5g borohydride
Potassium (see 5.1.3.5) dissolved, take 20mL diluted with water to 1000mL.
5.1.3.12 mercury standard stock solution (1.00mg/mL). Weigh accurately 0.1354g mercury (HgCl2, excellent pure chloride, sulfuric acid previously dry
Dryer placed 24h or more) in 50mL clean beaker, dissolved with a small amount of nitric acid solution (see 5.1.3.10), the total amount transferred
100mL flask with a nitric acid solution (see 5.1.3.10) set the volume to the mark, and mix.
5.1.3.13 mercury intermediate standard solution (10.0μg/mL). Pipette 1.00mL mercury standard stock solution (see 5.1.3.12) into 100mL
Flask, add nitric acid solution (see 5.1.3.10) to the mark and mix.
5.1.3.14 mercury intermediate standard solution (0.100μg/mL). Pipette 1.00mL mercury intermediate standard solution (see 5.1.3.13) into 100mL
Flask, add nitric acid solution (see 5.1.3.10) to the mark and mix.
5.1.3.15 use mercury standard solution (10.0ng/mL). Pipette 10.00mL mercury intermediate standard solution (see 5.1.3.14) into 100mL
Flask, add nitric acid solution (see 5.1.3.10) to the mark, and mix (when using the formulation).
5.1.4 instruments and equipment
Instruments and equipment are as follows.
--- Atomic fluorescence spectrometer;
--- Volumetric flask. capacity 100mL, 1000mL;
--- Pipette. Volume 1mL, 2mL, 5mL, 10mL;
--- Beaker. Capacity 50mL, 1000mL;
--- Standing general laboratory instruments and equipment.
5.1.5 Analysis of step
5.1.5.1 standard curve
5.1.5.1.1 measure 0mL, 0.25mL, 0.50mL, 1.00mL, 2.00mL, 4.00mL, 8.00mL mercury standard solution (see
5.1.3.15), were transferred to 100mL volumetric flask, add sulfuric acid solution (see 5.1.3.9) to the mark and mix. Respectively, injection 2.0mL, according to
Regression coefficients, the results recorded in Table A. 1.
5.1.5.2 sample determination
5.1.5.2.1 sample digestion. Measure 100mL water sample in 250mL conical flask, 2.0mL sulfuric acid (see 5.1.3.1), 5.0mL
Potassium persulfate solution (see 5.1.3.8), left at room temperature to digest 24h, or heated to boiling after 1min, cooled to room temperature, a solution of 2mL salt
Acid hydroxylamine solution (see 5.1.3.7), mix this solution as the sample digest.
5.1.5.2.2 Analysis Blank. amount of mercury-free water to 250mL 100mL conical flask, 2.0mL sulfuric acid (see 5.1.3.1),
5.0mL potassium persulfate solution (see 5.1.3.8), placing more than 24h digestion at room temperature or heated to boiling after 1min, cooled to room temperature,
2mL solution of hydroxylamine hydrochloride solution (see 5.1.3.7), mix this solution for the analysis of blank solution.
5.1.5.2.3 were taken 2.0mL sample digestion (see 5.1.5.3.1) and analysis of the blank solution (see 5.1.5.3.2) in the hydride generator
The blank fluorescence intensity was measured (Ib) and the sample digest fluorescence intensity (Is). In (Is-Ib) values obtained from the standard curve the amount of mercury (ng),
Or with a linear regression equation calculated the amount of mercury (ng).
5.1.6 recording and computing
The sample measurement data recorded in Table A. 2, according to equation (2) calculation of mercury content in seawater.
(2)
Where.
--- Ba concentration of mercury in water, in units of micrograms per liter (μg/L);
K --- after sample digestion volume correction factor of 1.09;
Vp --- injection volume in milliliters (mL).
5.1.7 precision and accuracy
Concentration of 1.00μg/L, the relative standard deviation of 2.5% repeatability; reproducibility relative standard deviation of 10.2%; relative error of 6.5%.
5.1.8 Precautions
The method implementation should note the following.
--- Unless otherwise indicated, the methods used were of analytical grade reagents and water for the mercury-free water or equivalent water.
--- After all the utensils used for testing must be soaked in a solution of nitric acid (1 + 3) in 24h, rinsed with deionized water before
use;
--- Do not allow the vessel during the test by mercury contamination.
The mercury content greater difference --- hydroxylamine hydrochloride, reagent blank should be tested before use, so as to avoid blank value is too large, resulting in an excessive measure
Fixed error.
--- Due to factors affecting the determination of mercury more, as the carrier gas flow rate, a mercury lamp current, negative high voltage, etc. Therefore, in each case measured standard assays
series.
5.2 cold vapor atomic absorption spectrophotometry
5.2.1 Scope and Application
Suitable for ocean, coastal and estuarine area measuring mercury in seawater.
5.2.2 Principle of the method
Water samples by sulfuric acid - potassium persulfate digestion, under the action of a reducing agent stannous chloride, mercury ions are reduced to metallic mercury, the use of gas - liquid equilibrium
Open intake system, characterized in that the determination of mercury atomic absorption wavelength 253.7nm value.
5.2.3 Reagents and preparation
5.2.3.1 potassium persulfate (K2S2O8)
5.2.3.2 anhydrous calcium chloride (CaCl2). For loading drying tube.
5.2.3.3 Low mercury sea. surface waters through a filter paper, the mercury content should be less than 0.005μg/L.
5.2.3.4 nitric acid solution (1 + 19). A 50mL nitric acid (ρ = 1.42g/mL) was slowly added to 1000mL water.
5.2.3.5 sulfuric acid solution (1 + 1). A 500mL sulfate (ρ = 1.84g/mL) was slowly added to 500mL of water.
5.2.3.6 sulfuric acid solution (0.5mol/L). under agitation 28mL sulfuric acid (ρ = 1.84g/mL) was slowly added to water, and dilute to
1L.
5.2.3.7 hydrochloric acid solution (1 + 1). diluted hydrochloric acid (ρ = 1.19g/mL) with an equal volume of water.
5.2.3.8 hydroxylamine hydrochloride solution (100g/L). Weigh 25g of hydroxylamine hydrochloride (NH2OH · HCl) was dissolved in water, and dilute to 250mL.
5.2.3.9 Stannous chloride solution. Weigh 100g stannous chloride (SnCl2) in the beaker, 500mL of hydrochloric acid solution (see 5.2.3.7),
Heated to completely dissolve the stannous chloride, cooled to prosper in the reagent bottle. Diluted with an equal volume of water just before using. Mercury impurities is high, in addition to nitrogen gas
Mercury until the mercury content undetectable.
5.2.3.10 mercury standard stock solution (1.00mg/mL-Hg). Weigh 0.1354g mercuric chloride (HgCl2, previously dry in sulfuric acid desiccator
Dry) in 10mL beaker with a solution of nitric acid (see 5.2.3.4) was dissolved, the total amount transferred to 100mL flask, was added nitric acid (see
5.2.3.4) diluted to the mark, and mix. Sheng in brown borosilicate glass vial, the solution can be stored for one year.
5.2.3.11 mercury intermediate standard solution (10.0μg/mL). Pipette 1.00mL mercury stock standard solution (see 5.2.3.10) in 100mL amount
Flask, add nitric acid solution (see 5.2.3.4) diluted to the mark, and mix. This solution may be held on the week.
5.2.3.12 use me...
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