采用控制和精密方法测定胺溶液中的表观硫化氢。在酸性介质中，用标准碘溶液氧化测定硫化氢。硫代硫酸盐（如果存在）也被滴定，并作为表观H2S包含在计算中。可使用UOP法818测定硫代硫酸盐，并从表观H2S浓度中减去由此获得的值。检测下限约为25格令/加仑。

A Control and a Precision method are used for the determination of apparent hydrogen sulfide in amine solutions. Hydrogen sulfide is determined by oxidation with standard iodine solution in an acid medium. Thiosulfate, if present, is also titrated and is included as apparent H2S in the calculation. Thiosulfate may be determined by using UOP Method 818, and the value thus obtained subtracted from the apparent H2S concentration. The lower limit of detection is approximately 25 grains/gallon.