US Geological Survey, Denver Federal Center, Denver, CO 80225, USA.
Talanta. 2003 May 1;59(6):1219-26. doi: 10.1016/S0039-9140(03)00032-8.
The compound 3-amino-4-hydroxyphenylarsonic acid (3-amino-HPAA) reacts with smectite to form a soluble azobenzene arsonic acid compound. This reaction is of particular interest because it provides a possible mechanism for the formation of a new type of arsenic compound in natural water systems. 3-Amino-HPAA is a degradation product excreted by chickens that are fed rations amended with roxarsone. Roxarsone is used to control coccidial intestinal parasites in most of the broiler chickens grown in the United States. The structure of the azobenzene arsonic acid compound was first inferred from negative-ion and positive-ion low-resolution mass-spectrometric analyses of the supernatant of the smectite suspension. Elemental composition of the parent ion determined by high-resolution positive-ion mass spectrometric measurements was consistent with the proposed structure of the azobenzene arsonic acid compound.
3-氨基-4-羟苯基胂酸（3-氨基-HPAA）与蒙脱石反应生成一种可溶性偶氮苯胂酸化合物。这一反应非常有趣，因为它为天然水系统中一种新型砷化合物的形成提供了一种可能的机制。3-氨基-HPAA 是一种由用罗硝唑改良的鸡饲料喂养的鸡排泄的降解产物。罗硝唑用于控制美国大部分肉鸡中球虫肠道寄生虫。偶氮苯胂酸化合物的结构首先是通过对蒙脱石悬浮液上清液的负离子和正离子低分辨率质谱分析推断出来的。通过高分辨率正离子质谱测量确定的母体离子的元素组成与所提出的偶氮苯胂酸化合物的结构一致。
