H2S gas with purity of 99.99% (Tianjin Saiteer Special Gases Co., Ltd, Tianjin, China) was injected into the glass container with an injector through the rubber plug to the final concentrations of 0, 10, 15,20 ll L_1.
H2S gas with purity of 99.99% (Tianjin Saiteer Special Gases Co., Ltd,Tianjin, China) was injected into the glass container with an injectorthrough the rubber plug to the final concentrations of 0, 10, 15,20 ll L_1.