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HJ/T 56-2000 English PDF (HJT56-2000)

HJ/T 56-2000 English PDF (HJT56-2000)

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HJ/T 56-2000: Determination of sulphur dioxide from exhausted gas of stationary source - Iodine titration method

This Standard specifies the iodine titration method to determine the concentration of sulphur dioxide from exhausted gas of stationary source as well as the determination of sulfur dioxide emission rate.
HJ/T 56-2000
HJ
STANDARD OF STATE ENVIRONMENTAL
PROTECTION ADMINISTRATION
Determination of sulphur dioxide from exhausted gas
of stationary source - Iodine titration method
ISSUED ON. DECEMBER 07, 2000
IMPLEMENTED ON. MARCH 1, 2001
Issued by. State Environmental Protection Administration of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Determination method-principle, determination range and determination error ... 4
4 Influential factors ... 4
5 Apparatus ... 5
6 Reagents ... 5
7 Sampling ... 7
8 Determination ... 8
9 Calculation ... 8
10 Calculation of sulfur dioxide emission rate ... 8
Foreword
This Standard specifies the iodine titration method to determine the concentration of sulphur dioxide from exhausted gas of stationary source as well as its total emission. During the formulating, this Standard referred to the national standard. GB/T 16157- 1996 ?€?The determination of particulates and sampling methods of gaseous pollutants emitted from exhaust gas of stationary source?€? and parts of ?€?Air and waste gas monitoring analysis method?€? issued by State Environmental Protection Administration in 1990. It also referred to relevant sampler?€?s technical indicators and domestic-foreign enterprise standards.
This Standard was proposed by Department of Science, Technology and Standards of State Environmental Protection Administration.
This Standard was drafted by China National Environmental Monitoring Center. This Standard shall be interpreted by State Environmental Protection Administration. Determination of sulphur dioxide from exhausted gas
of stationary source - Iodine titration method
1 Scope
This Standard specifies the iodine titration method to determine the concentration of sulphur dioxide from exhausted gas of stationary source as well as the determination of sulfur dioxide emission rate.
2 Normative references
The following standard contains the provisions which, through reference in this Standard, constitute the provisions of this Standard. It has the same effect as this Standard.
GB/T 16157-1996 The determination of particulates and sampling methods of gaseous pollutants emitted from exhaust gas of stationary source
3 Determination method-principle, determination range and
determination error
Sulfur dioxide from exhausted gas is absorbed by the mixed solution of ammonium sulfamate. Use iodine standard solution to titrate. Calculate the sulfur dioxide concentration according to the titration. Reactions are shown as follows. Determination range. 100 ~ 6000 mg/m3; within the determination range, the batch error of the method shall not be greater than ?? 6%.
4 Influential factors
4.1 When boiler fuel is burning under normal conditions, the content of reducing substances such as H2S in the exhausted gas is very little; its influence to the determination is negligible.
4.2 Ammonium sulfamate in absorption solution can eliminate the influence of carbon 7.3 Sampling frequency
Under same working conditions, it shall determine three times in a row; take the average value as determination result.
8 Determination
After sampling, it shall titrate the sample as soon as possible. The sample shall not be placed for more than 1h. Move all samples in two absorption bottles into the iodine bottle. Use a small amount of absorption solution (6.1) to respectively wash the absorption bottle twice. Move the washing solution into the iodine bottle as well. Shake well. When adding 50 ml of 2 g/L starch solution (6.3), use 0.010 mol/L iodine standard solution (6.8) to titrate to blue. Record the consumption V (ml).
Separately, take the absorption solution (6.1) of same volume. Conduct blank titration in the same method. Record the consumption V0 (ml).
If the sulfur dioxide concentration of the gas is high, it shall take part of absorption solution to titrate. At this time, the result calculated according the equation listed in Clause 9 shall be divided by the ratio of partial absorption solution accounting for total absorption solution.
9 Calculation
Where,
c?€? - sulfur dioxide concentration of dry gas under standard conditions (mg/m3); c(1/2 I2) - concentration of iodine stock solution (mol/L);
Vnd - sampling volume of dry gas under standard conditions (L);
32.0 - the mass (g) of sulfur dioxide (1/2 SO2) that is equal to 1 L of 1 mol/L iodine standard solution (1/2 I2).
10 Calculation of sulfur dioxide emission rate
10.1 Determination and calculation of exhausted gas flow
According to provisions in 7.1 ~ 7.5 of GB/T 16157-1996, measure the exhaust flow rate. According to provisions in 7.6, calculate dry exhaust gas flow Qsn (m3/h) under standard conditions.
Where,
Qsn - dry exhaust gas flow under standard conditions.
10.2 Calculation of sulfur dioxide emission rate
10.2.1 When sulfur dioxide concentration is represented in ppm (V/V), its concentration c can be converted to sulfur dioxide concentration of dry gas under standard conditions, according to the following equation.
Where,
c?€? - sulfur dioxide concentration of dry gas under standard conditions (mg/m3). 10.2.2 Calculation of sulfur dioxide emission rate G

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