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研究Ｔｗｅｎ水溶液中硫氰酸铋（Ⅲ）配合物的吸收光谱，得到λｍａｘ＝４７０ｎｍ，较ＤＭＳＯ、水介质中显色反应的灵敏度提高一倍．在显色条件ｐＨ＝０．６６，Ｉ＝０．３２下，硫氰酸铵浓度在０．２０～０．３２ｍｏｌＬ－１范围内Δε与硫氰酸铵浓度呈函数关系．用改善了的Ｙａｔｓｉｍｉｒｓｋｉｓ方法处理数据，得到β１＝０．８５７，β２＝３．２０，β３＝４．０９，β４＝７．５０及Δε１＝１．６０×１０３，Δε２＝５．７８×１０３，Δε３＝４．４４×１０３，Δε４＝７．３４×１０３．并测出显色反应的热力学参数ΔＨ＝－１１７．８ｋＪｍｏｌ－１，ΔＧ＝－５．０６ｋＪｍｏｌ－１（ｔ＝２５℃）．
The absorption spectrum of bismuth thiocyanate (Ⅲ) complex in Twen aqueous solution was studied and λ max = 470 nm, which is twice as sensitive as DMSO and aqueous media. Under the condition of pH = 0.66 and I = 0.32, the Δε is a function of ammonium thiocyanate concentration in the range of 0.20 ~ 0.32molL-1. The data were processed with the improved Yatsimirskis method, resulting in β1 = 0.857, β2 = 3.20, β3 = 4.09, β4 = 7.50 and Δε1 = 1.60x103, Δε2 = 5.78x103, Δε3 = 4.44 × 103, Δε4 = 7.34 × 103. The thermodynamic parameters ΔH = -117.8kJmol-1 and ΔG = -5.06kJmol-1 (t = 25 ℃) were measured.