Fast Determination of the Main Reduced Sulfur Species in Aquatic Systems by a Direct and Second-Derivative Spectrophotometric Method

Table 2

Limit of detection (LOD) obtained for total sulfide, sulfite, and thiosulfate as a function of sample dilution, salinity, and concentrations of humic acids, yeast extract, and nitrate for which first interferences with sulfur compounds occur.

Dilution	LOD (µM)			Interferences
	Total sulfide	Total sulfite	Total thiosulfate	Humic acids range (mg/L)	Yeast extract range (mg/L)	NaCl range (g/L)/without salinity correction	NO3 range (µM)
X 10	14	73	19	75	30	>320/12	200
X 20	27	146	38	150	60	>320/24	400
X 40	55	293	77	300	120	>320/48	800