HJ 536-2009 PDF in English
HJ 536-2009 (HJ536-2009) PDF English
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Water quality - Determination of ammonia nitrogen - Salicylic acid spectrophotometry
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Standards related to (historical): HJ 536-2009
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HJ 536-2009: PDF in English HJ 536-2009
HJ
National Environmental Protection Standard
of the People’s Republic of China
Replaces GB 7481-87
Water quality - Determination of ammonia
nitrogen - Salicylic acid spectrophotometry
ISSUED ON. DECEMBER 31, 2009
IMPLEMENTED ON. APRIL 1, 2010
Issued by. Ministry of Environmental Protection
Notice
of Ministry of Environmental Protection
of the People’s Republic of China
2009 No. 77
In order to implement the Environmental Protection Act of the People's Republic of China,
protect the environment and guarantee human health, hereby we approved and released
the Air and exhaust gas - Determination of ammonia - Nessler's reagent
spectrophotometry and other five standards as national environmental protection
standards.
Standard names and standard numbers are as follows.
1. Ambient air and exhaust gas - Determination of ammonia - Nessler's reagent
spectrophotometry (HJ 533-2009);
2. Ambient air - Determination of ammonia - Sodium hypochlorite - salicylic acid
spectrophotometry (HJ 534-2009);
3. Water quality - Determination of ammonia nitrogen - Nessler's reagent
spectrophotometry (HJ 535-2009);
4. Water quality - Determination of ammonia nitrogen - salicylic acid
spectrophotometry (HJ 536-2009);
5. Water quality - Determination of ammonium nitrogen - Distillation-neutralization
titration (HJ 537-2009).
The above standards have been implemented since April 1, 2010. They are published by
China Environmental Science Press. The standards’ content can be found at the website
of the Ministry of Environmental Protection (bz.mep.gov.cn).
From the date of the implementation of the above standards, the national environmental
standards approved and published by the former State Environmental Protection
Administration shall be abolished. The standard names, numbers are as follows.
1. Air quality - Determination of ammonia - Nessler's reagent colorimetric method
(GB/T 14668-93);
2. Air quality - Determination of ammonia - Sodium hypochlorite - salicylic acid
spectrophotometry (GB/T 14679-93);
3. Water quality - Determination of ammonium - Nessler's reagent colorimetric
method (GB 7479-87);
4. Water quality - Determination of ammonium - salicylic acid spectrophotometry
(GB 7481-87);
5. Water quality- Determination of ammonium - Distillation and titration method
(GB 7478-87)
Hereby it is noticed.
December 31, 2009
Table of Contents
Foreword ... 5
1 Application scope ... 6
2 Method principle ... 6
3 Interference and elimination ... 6
4 Reagents and materials... 6
5 Instruments and equipment ... 9
6 Sample ... 9
7 Analytical procedures ... 9
8 Results representation ... 10
9 Accuracy and precision ... 11
10 Quality assurance and quality control ... 11
Appendix A ... 13
Appendix B ... 15
Foreword
In order to implement the Environmental Protection Act of the People's Republic of China
and the Water Pollution Prevention Act of the People's Republic of China, protect the
environment, guarantee human health and standardize the monitoring methods of
ammonia nitrogen in water, hereby this standard is announced.
This standard specifies the determination of ammonia nitrogen in water by salicylic acid
spectrophotometry.
This standard is revision to Water quality - Determination of ammonium- salicylic acid
spectrophotometry (GB 7481-87).
This standard was initially published in 1987. And the original drafting organization was
Jiangxi Province Ganzhou Environmental Monitor Station. This standard is revised for the
first time. The main revised contents are as follows.
— The name of the standard is revised from Water quality - Determination of
ammonium - Salicylic acid Spectrophotometry TO Water quality - Determination of
ammonium nitrogen - Salicylic acid spectrophotometry.
— Add the 30mm cuvette test method. Reduce the detection limits. Broaden the
application range of the method. Clearly specify the lower and upper limits of the
method.
— Combine the result calculation formulae.
— Modify the normative appendix.
The Water quality-Determination of ammonium-Salicylic acid Spectrophotometry (GB
7481-87) approved and released by the former State Environmental Protection Agency on
March 14, 1987 shall be abolished, from the date of implementation of this standard.
Appendix A of this standard is normative. Appendix B is informative.
This standard was organized and formulated by Department of Science, Technology and
Standards, Ministry of Environmental Protection of the People’s Republic of China.
This standard was mainly drafted by. Municipal Environmental Monitoring Center Station
of Shenyang.
This standard was approved by Ministry of Environmental Protection on December 31,
2009.
This standard shall be implemented from April 1, 2010.
The Ministry of Environmental Protection is responsible for the interpretation of this
standard.
Water quality-Determination of ammonia nitrogen-
Salicylic acid spectrophotometry
1 Application scope
This standard specifies the salicylic acid spectrophotometry to determine ammonia
nitrogen in water.
This standard applies to determination of ammonia nitrogen in groundwater, surface water,
domestic sewage, and industrial wastewater.
When the sample volume is 8.0 ml and the 10 mm cuvette is used, the detection limit of
this method is 0.01 mg/L, the determination lower limit is 0.04mg/L, and the determination
upper limit is1.0mg/L (all counted in N).
When the sample volume is 8.0 ml and the 30mm cuvette is used, the detection limit of
this method is 0.004 mg/L, the determination lower limit is 0.016mg/L, and the
determination upper limit is 0.25mg/L (all counted in N).
2 Method principle
Under the condition that the alkaline medium (pH=11.7) and the sodium nitroprusside
exist, chemical reactions happen AMONG the ammonia, ammonium ions AND the
salicylate AND hypochlorite ions in water, to generate blue compound. Measure the
absorbency with a spectrophotometer at 697nm.
3 Interference and elimination
This method applies to the possible interfering substance and quantity limit during water
sample analysis, see Appendix B for details.
Severe interferences generated by aniline and ethanol amine are rare. Usually the
interference is generated by primary amine. When it contains chloramines, excessively
high acidity, alkalinity, or when it contains substances that make hypochlorite ions
reduction, the interferences may be generated.
If the color of the water sample is too dark, or the salt is excessive, or when the masking
ability of the potassium tartrate to the metal ions in the water sample is insufficient, or
when there is high concentration of calcium, magnesium and chloride in the water sample,
pre-distillation is required.
4 Reagents and materials
Unless otherwise specified, the reagents used in analysis shall be analytical pure
hydroxide solution (4.6), until the salicylic acid is fully dissolved. And use 1mol/L of sulfuric
acid to adjust PH of the solution to 6.0-6.5.
Appendix A
(Normative)
The preparation method of sodium hypochlorite solution and calibration of
effective chlorine concentration and free-base concentration
A.1 The preparation method of sodium hypochlorite solution
Put hydrochloric (ρ=1.19g/ml) acid, drop by drop, on the solid of potassium permanganate.
Guide the escaping chlorine into 2mol/L of sodium hydroxide absorption liquid for
absorption, so as to generate the sodium hypochlorite solution in light grass green. Store
in a plastic bottle. As this solution is not stable, the effective chlorine concentration shall
be calibrated prior to use.
A.2 The measurement of effective chlorine in the sodium hypochlorite solution
Absorb 10.0ml of sodium hypochlorite (4.8) into 100mml volumetric flash. Add water to
dilute to marked line. Mix well. Move 10.0ml of diluted sodium hypochlorite solution into
250ml iodine flask. Add 40ml of distilled water and 2.0g potassium iodide. Mix well. Add
5.0 mL of 6mol/L sulfuric acid solution. Mix well. Place in dark for 5min. Use 0.1mol/L of
sodium thiosulfate solution to titrate to light yellow. Add approximately 1ml of starch
indicator. Continue to titrate it until the blue color disappears. Its mass concentration of
effective chlorine shall be calculated as per Equation (A.1).
Effective chlorine (g/L, in Cl2) =
Where.
c — Sodium thiosulphate solution concentration, mol/L;
V — The volume of consumed sodium thiosulfate at titration, ml;
35.45 — Molar mass of effective chlorine (1/2Cl2), g/mol.
A.3 Determination of free-base (NaOH) in sodium hypochlorite solution
A.3.1 Calibration of hydrochloric acid
Sodium carbonate standard solution. c(1/2Na2CO3)=0.1000 mol/L. Weigh 2.6500g of
anhydrous sodium carbonate that has been dried under 180°C for...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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