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Lead dust is dissolved by HNO3 acid and H2O2 mixture at temperatures 180 ± 50 c. After it is determined by the method of atomic absorption spectroscopy using graphite oven, measure the absorbance at a wavelength of 283.3 nm, has background correction.This method is based on the effect of ammonium hypochlorite and phenol created the green complexes. Comparison of color in 625 nm wavelength.H2S gas is absorbed by the Cd (OH) 2 create metal Cd. Then for the response forms complexes with Methylene blue and FeCl3. Compare the color in 680 nm wavelength on the UV-VIS.
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