溴甲酚紫分光光度法测定水中的阴离子表面活性剂

在pH=2的酸性条件下,十二烷基苯磺酸钠(SDBS)阴离子表面活性剂能与溴甲酚紫直接缔合,生成浅黄色缔合物;据此建立了测定水中SDBS阴离子表面活性剂的分光光度法.结果表明,生成的浅黄色缔合物的最大吸收波长为436nm,SDBS的表观摩尔吸光系数为1.68×104 L·mol-1·cm-1;SDBS的浓度在0²mg·L-1范围内时遵循比尔定律.该方法可方便地用于测定水样中的痕量阴离子表面活性剂,效果良好.

Determination of anionic spectrophotometry based surfactant in water by on bromcresol purple

Sodium dodeeyl benzene sulfonate（SDBS）, an anionic surfactant, is able to directly react with bromocresol purple under acidic condition （pH = 2） yielding a light-yellow association compound. Thus a spectrophotometric method was established accordingly to detect SDBS anionic surfactant in water. It was found that as-generated light-yellow association compound has a maximum absorption wavelength of 436 nm, and apparent molar absorption coefficient of SDBS is determined to be 1.68× 10^4 L .mol .cm^-1. Besides, Bill＇s law is obeyed in the SDBS concentration range of 0-2 mg .L^-1 ; and the established method can be well adopted to detect trace amount of anionic surfactants in water.