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GB/T 22105.1-2008 PDF in English


GB/T 22105.1-2008 (GB/T22105.1-2008, GBT 22105.1-2008, GBT22105.1-2008)
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GB/T 22105.1-2008: PDF in English (GBT 22105.1-2008)

GB/T 22105.1-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.080.05
Z 18
Soil quality - Analysis of total mercury, arsenic and lead
contents - Atomic fluorescence spectrometry - Part 1:
Analysis of total mercury contents in soils
ISSUED ON: JUNE 27, 2008
IMPLEMENTED ON: OCTOBER 1, 2008
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Principles ... 4
3 Reagents ... 4
4 Instruments and equipment ... 6
5 Analysis steps ... 6
6 Result presentation ... 7
7 Precision and accuracy ... 8
8 Notes ... 8
Soil quality - Analysis of total mercury, arsenic and lead
contents - Atomic fluorescence spectrometry - Part 1:
Analysis of total mercury contents in soils
1 Scope
This part of GB/T 22105 specifies the atomic fluorescence spectrometry method for the
determination of total mercury content in the soil.
This part applies to the determination of total mercury content in the soil.
The detection limit of the method of this part is 0.002 mg/kg.
2 Principles
The mixed reagent of nitric acid-hydrochloric acid is used to heat and digest the soil
sample in a boiling water bath, and then potassium borohydride (KBH4) or sodium
borohydride (NaBH4) is used to reduce the mercury contained in the sample to atomic
mercury, which is introduced into the atomizer by the carrier gas (argon); under the
irradiation of a special mercury hollow cathode lamp, the mercury atoms in the ground
state are excited to a high-energy state; when deactivated and returned to the ground
state, they emit fluorescence at a characteristic wavelength, and the fluorescence
intensity is proportional to the mercury content. Compared with the standard series, the
content of mercury in the sample is obtained.
3 Reagents
Unless otherwise specified, the reagents used in this part are analytical reagents, and
the test water is deionized water.
3.1 Hydrochloric acid (HCl): ρ=1.19 g/mL, guarantee reagent.
3.2 Nitric acid (HNO3): ρ=1.42 g/mL, guarantee reagent.
3.3 Sulfuric acid (H2SO4): ρ=1.84 g/mL, guarantee reagent.
3.4 Potassium hydroxide (KOH): guarantee reagent.
3.5 Potassium borohydride (KBH4): guarantee reagent.
3.6 Potassium dichromate (K2Cr2O7): guarantee reagent.
3.7 Mercury chloride (HgCl2): guarantee reagent.
3.8 Nitric acid-hydrochloric acid mixed reagent [(1+1) aqua regia]: Mix 1 part of nitric
acid (3.2) with 3 parts of hydrochloric acid (3.1), and then dilute one time with
deionized water.
3.9 Reducing agent [0.01% potassium borohydride (KBH4) + 0.2% potassium
hydroxide (KOH) solution]: Weigh 0.2 g of potassium hydroxide (3.4), put it into a
beaker, and add a small amount of water to dissolve; weigh 0.01 g of potassium
borohydride (3.5), put it into potassium hydroxide solution, and dilute to 100 mL with
water; prepare this solution for current use.
3.10 Carrier liquid [(1+19) nitric acid solution]: Take 25 mL of nitric acid (3.2), slowly
pour it into a 500 mL volumetric flask in which there is a small amount of deionized
water, dilute to the mark with deionized water, and shake well.
3.11 Preservation solution: Weigh 0.5 g of potassium dichromate (3.6), dissolve it with
a small amount of water, add 50 mL of nitric acid (3.2), dilute the solution to 1000 mL
with water, and shake well.
3.12 Diluent: Weigh 0.2 g of potassium dichromate (3.6), dissolve it with a small
amount of water, add 28 mL of sulfuric acid (3.3), dilute the solution to 1000 mL with
water, and shake well.
3.13 Mercury standard stock solution: Weigh 0.1354 g of mercuric chloride (3.7) that
has been dried, dissolve it with the preservation solution (3.11), transfer it to a 1000 mL
volumetric flask, and then use the preservation solution (3.11) to dilute to the mark;
shake well. The concentration of mercury in this standard solution is 100 μg/mL (the
able organizations can purchase the standard stock solution directly from the
department recognized by the country).
3.14 Mercury standard intermediate solution: Pipette 10.00 mL of mercury standard
stock solution (3.13) into a 1000 mL volumetric flask, dilute to the mark with
preservation solution (3.11), and shake well. The concentration of mercury in this
standard solution is 1.00 μg/mL.
3.15 Mercury standard working solution: Pipette 2.00 mL of mercury standard
intermediate solution (3.14) into a 100 mL volumetric flask, dilute to the mark with
preservation solution (3.11), and shake well. The concentration of mercury in this
standard solution is 20.0 ng/mL (prepare this solution for current use).
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.