Mikasa H, Suzuki Y, Fujii N, Nishiyama K
Department of Hygiene, School of Medicine, University of Tokushima, Japan.
Biol Trace Elem Res. 1988 Jun;16(1):59-66. doi: 10.1007/BF02795334.
The adsorption of zinc and lead on hair was dependent on the acidity of the hair and/or the medium in which the hair sample was immersed, suggesting that hair is an ion exchanger. The pKa was estimated to be between 4.5 and 5.0. The coexistence of mercuric ion or PCMB reduced zinc adsorption by only a few percent, whereas zinc inhibited mercuric ion adsorption to a greater extent. These facts suggest that the binding sites in hair for metals are located on functional groups like carboxyl groups rather than sulfhydryl groups. The removal and/or elution of metals from hair were observed for 18 elements by various washing procedures. By treating hair with a water solution of detergent, alkaline metals were eluted to a great extent, whereas alkaline earth metals were eluted to some extent. The other metals did not vary with any procedures tested.
锌和铅在头发上的吸附取决于头发的酸度和/或浸泡头发样本的介质，这表明头发是一种离子交换剂。据估计，其pKa在4.5至5.0之间。汞离子或对氯汞苯甲酸的共存仅使锌的吸附减少了几个百分点，而锌对汞离子吸附的抑制作用更大。这些事实表明，头发中金属的结合位点位于羧基等官能团上，而非巯基。通过各种洗涤程序，观察到18种元素从头发中去除和/或洗脱的情况。用洗涤剂水溶液处理头发时，碱金属大量洗脱，碱土金属有一定程度的洗脱。其他金属在任何测试程序下都没有变化。
