... box Fast, Easy-to-Use, Accurate Sulfide Test Kit (DPD Method)1. SpecificationName: ozone (with residual chlorine) in water test kitModel ... the analysis of one water sample.Accurate and reliableThis method equals to N, N-diethyl-p-phenylenediamine (DPD ... thus eroding the sewer. Therefore, the sulfide is an important indicator of water pollution (clean water, olfactory threshold for hydrogen sulfide ...