Environmental Sciences Group, Royal Military College of Canada, Stn. Forces, Kingston, ON, Canada.
Chemosphere. 2012 Oct;89(7):838-43. doi: 10.1016/j.chemosphere.2012.05.005. Epub 2012 Jun 1.
Cr(VI) is far more soluble and toxic than Cr(III). Sediment pore water was investigated in a river adjacent to the property of a large former tannery, into which Cr-contaminated effluent was discharged over a 55-year period, and where extremely high Cr concentrations have been found in the sediments. Dialysis cells, or peepers, were used to generate depth profiles of Cr concentration in sediment pore water. Samples were analyzed for total Cr using inductively coupled plasma-mass spectrometry (ICP-MS) and for Cr species using high performance liquid chromatography (HPLC)-ICP-MS. The results show an absence of Cr(VI) in all samples. Furthermore, incomplete recovery of Cr(VI) added to the samples collected at the locations with highest sediment Cr concentrations indicate strong reducing conditions at those locations, which are not conducive to the presence of Cr(VI).
六价铬的水溶性和毒性远高于三价铬。研究了一条毗邻大型制革厂的河流中的沉积物孔隙水，该厂在过去 55 年中排放了含铬废水，沉积物中发现了极高浓度的铬。采用透析池（或窥视器）生成沉积物孔隙水中铬浓度的深度分布。使用电感耦合等离子体质谱法（ICP-MS）分析总铬，使用高效液相色谱-电感耦合等离子体质谱法（HPLC-ICP-MS）分析铬形态。结果表明所有样品中均不存在六价铬。此外，在沉积物铬浓度最高的地点采集的样品中添加的六价铬回收率不完全，表明这些地点存在强烈的还原条件，不利于六价铬的存在。
