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邻苯二酚紫(PV)-十六烷基三甲基溴化铵(CTAB)胶束增溶光度法测定锡,已有多次报导,它比邻苯二酚紫-锡络合物的灵敏度提高了近二分之一,克分子吸光系数由ε_(555)=65000提高至ε_(662)=95600,最大吸收红移了107nm。由于红移,试剂本身的吸光度很小。显色的酸度,多数的方法是在pH2.2,部分的是在0.4N或0.2N硫酸溶液中。在特定的pH下,邻苯二酚紫与许多金属形成深色络合物,表1。
Determination of tin by catechol violet (PV) -hexadecyltrimethylammonium bromide (CTAB) micellar solubilization spectrophotometry has been reported for many times and is more sensitive than the sensitivity of the catechin violet-tin complex And the absorption coefficient increased from ε 555 = 65000 to ε 664 95600, and the maximum absorption red shifted 107 nm. Due to the red shift, the absorbance of the reagent itself is small. The color of acidity, most of the way is at pH2.2, part of the 0.4N or 0.2N sulfuric acid solution. At a particular pH, catechol violet forms a dark complex with many metals, Table 1.