translation: Determination of Sulfide in Water Quality According to HJ/T 60-2000 Iodometry Method
Sulfide is an important environmental pollutant and its concentrations must be determined to assess water quality. HJ/T 60-2000 iodometry method is a reliable and widely-used qualitative method used to measure sulfide concentration up to 100 mg/L. This method has proven quite reliable with only slight variations in results reported when compared with other measurement methods.
In this method, the sulfide concentration is determined by titrating a sample of water with iodine in the presence of a starch indicator until a color change is observed. The sulfur content of the sample is calculated by subtracting the determined iodine consumption from a known amount of iodine added to the sample.
The sample preparation for this method includes filtering the sample and adding sulfur dioxide to the filtered sample. The sulfur dioxide causes the sulfide in the water to form hydrogen sulfide, which is better detected by the titration. The sample should then be acidified and heated to convert any organic sulfur compounds to sulfide. The sample is then titrated with the iodine solution, which must be standardized before the analysis begins.
The determination of sulfide in water according to HJ/T 60-2000 is done by adding 0.2g of sulfate to the sample bottle and agitating it for 10 minutes. The flask is then filled to capacity with a standardized iodine solution. Titration is then conducted until a blue black color change is observed. After the titration is complete, a correction factor is applied and the sulfide concentration of the sample can be determined.
The results obtained from this method should be checked against a standard and the results should be used to identify the potential sources of sulfide in the sample, such as industrial stacks or sewage systems. The results of the method can also be used to estimate the long-term impact of sulfide on water quality.
Overall, the method described in HJ/T 60-2000 iodineometry is a valuable and reliable method to measure the sulfide concentration in water. It is easy to use and the results can be quickly and accurately obtained with relatively low cost. With proper calibration, it can produce consistent results, making it a preferred method to measure sulfide levels.
