Sulfide Test Kit（DPD Method）
Background of development
Sources of sulfide
Ground water (especially hot spring water) and domestic sewage usually contain sulfides, some of which are produced by decomposition of sulfur-containing organic compounds or sulfate reducing due to the role of bacteria under anaerobic condition. Industrial wastewater coming from industrial and mining enterprises, such as coking, gas, ore dressing, dyeing, tanning and etc., also contain sulfides.
Sulfides in water mainly include H2S, HS- and S2-. Sulfides existing in suspensions are soluble sulfides, acid-soluble metal sulfides and the non-ionized organic, inorganic sulfides.
Significance of sulfide test
Hydrogen sulfide can easily dissipate from the water into the air, producing the stink smell and with high toxicity. It can react with the disulfide bonds of oxidase, cytochrome in human body and other such substances, affecting the oxidation process of cellular, resulting in tissue hypoxia and endangering human life. In addition to its own capability of corrosion of metals, hydrogen sulfide can also be oxidized into sulfuric acid by the biology in sewage, thus eroding the sewer. Therefore, the sulfide is an important indicator of water pollution (clean water, olfactory threshold for hydrogen sulfide is 0.035μg / L).
Principle
This method equals to N, N-diethyl-p-phenylenediamine (DPD) method (GB/T5750.6 -2006). In the presence of high-iron ions, sulfides react with N, N-diethyl-p- phenylenediamine to form a blue complex.
Features of product
Quick and easy
Operating in accordance with the instructions, users can complete the sulfide test independently without specialized training. Five minutes is enough to complete the analysis of one water sample.
Accurate and reliable
Determination results with this method are in accordance with the results with the standard method. It can be used as an alternative method to the standard method.
The range of the determination: 0.02～0.8mg/L. If the concentration is out of the range, please repeat the operation after appropriate dilution of the water sample.
Quantitative packing
The kit can be used for 50 times. It is small in size, light of weight and easy to carry.
Application areas
This product can be used in analysis of sulfide in drinking water, surface water, fishery water, wastewater and etc..