日用化学工业2012，Vol.42Issue(1)：72-75,4.
分光光度法测定水中微量阴离子表面活性剂
Determination of slight amount of anionic surfactants in water by spectrophotometry
何晓玲1
作者信息
- 1. 淮北师范大学化学与材料科学学院,安徽 淮北235000
- 折叠
摘要
Abstract
In an aqueous solution of NaOH with pH adjusted to 12 by HC1,cetylpyridinium chloride (CPC) was added together with a solution of 5 - methyl -2-[3-(4- phenylthiazol - 2 - yl) triazenyl ] benzenesulfonic acid (MPTTBSA) ,and an ion - associate complex MPTTBSA - CPC was formed. When an anionic surfactant was introduced into the above - said solution , MPTTBSA in the ion - associate complex will . Be replaced quantitatively by the anionic surfactant, and absorbance at maximum absorbing wavelength 556 nm of MPTTBSA - CPC will decline. The absorbance decrease is proportional to concentration of anionic surfactant with good linearity. Based on this phenomenon, a photometric method for determining the anionic surfactant content in water was established. Experimental results showed that the apparent molar absorbance index for anionic surfactant sodium lauryl sulfonate (SLS) and sodium dodecyl benzene sulfonate (SDBS) is L 24 x 104 L ? Mol-1 ? Cm-1 and 1.07 × 104 L ? Mol-1 ? Cm-1 respectively and they follow Beer' s law within range of 0 ~ 2.5 × 10-5 mol ? L-1 The method has been applied to determination of slight amount of anionic surfactants SLS in waste water samples. The determination results are virtually consistent with that determined by methylene blue method.关键词
阴离子表面活性剂/氯化十六烷基吡啶/分光光度法/5-甲基-2-[3-(4-苯基-2-噻唑基)三氮烯基]苯磺酸Key words
anionic surfactant/ cetylpyridinium chloride/ spectrophotometry/ 5 - methyl -2-[3-(4- phenylthiazol -2 -yl) triazenyl] benzenesulfonic acid分类
化学工程引用本文复制引用
何晓玲..分光光度法测定水中微量阴离子表面活性剂[J].日用化学工业,2012,42(1):72-75,4.
