A method for determination of PGE-Re concentrations and Os isotopic compositions in environmental materials
A method for determination of PGE-Re concentrations and Os isotopic compositions in environmental materials
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DOI：
10.1039/c3ay42064g
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发表时间：
2014-07
影响因子：
3.1
通讯作者：
Peipei Zhao;Jie Li;Li-feng Zhong;Sheng-ling Sun;Ji‐Feng Xu
中科院分区：
文献类型：
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作者：
Peipei Zhao;Jie Li;Li-feng Zhong;Sheng-ling Sun;Ji‐Feng Xu
汽车催化剂排放不仅导致 Pt、Pd 和 Rh 的环境浓度增加，而且还导致 Os、Ir 和 Ru 的浓度增加。人们对环境中铂族元素 (PGE) 和 Re 的行为及其对人类的潜在风险知之甚少，因此，有必要监测环境样品中的 Os、Ir、Ru 和 Re 浓度。我们提出了一种改进的程序，分别通过同位素稀释电感耦合等离子体质谱 (ID-ICP-MS) 和负热电离质谱 (N-TIMS) 测定环境参考材料 BCR-723 的 PGE-Re 浓度和 Os-187/Os-188 比率。样品在 Carius 管中用反王水消化。通过 CCl4 溶剂萃取进行 Os 分离后，使用阳离子交换和 N-苯甲酰基-N-苯基羟胺 (BPHA) 萃取树脂，通过两级串联柱装置依次对样品基质元素中的 PGE 和 Re 进行分离和纯化。在 ID-ICP-MS 测定 PGE 和 Re 之前，0.1 mol L-1 HCl 的洗脱可有效去除最终纯化样品中的干扰元素，例如 Zr、Hf、Mo 和 Cd。 BCR-723 分析可得到可重复的结果，明确的平均 Pt、Pd、Os、Ir、Ru 和 Re 浓度分别为 79.8 +/- 6.0、4.6 +/- 0.8、0.37 +/- 0.04、0.23 +/- 0.12、1.1 +/- 0.3 和 6.5 +/- 0.1 ng g(-1) （95% 置信度；n = 10）。该标准品的 Os-187/Os-188 比率确定为 0.537 +/- 0.022（95% 置信水平；n = 10）。这是针对 BCR-723 报道的第一个全面的 PGE 和 Re 浓度以及 Os 同位素组成，并为评估自动催化剂 PGE 测量和环境材料相关研究的数据质量提供了明确的标准。该方法成功用于城市道路灰尘样品中PGE和Re浓度以及Os同位素组成的测定。
Automobile catalyst emissions not only result in increasing environmental concentrations of Pt, Pd, and Rh, but also Os, Ir, and Ru. Little is known about the behavior of platinum-group elements (PGE) and Re in the environment and their potential risk to humans and, as such, the monitoring of Os, Ir, Ru, and Re concentrations in environmental samples is necessary. We present an improved procedure for determination of PGE-Re concentrations and Os-187/Os-188 ratios of the environmental reference material BCR-723 by isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS) and negative thermal ionization mass spectrometry (N-TIMS), respectively. The sample is digested with inverse aqua regia in a Carius tube. After Os separation by CCl4 solvent extraction, separation and purification of PGE and Re from sample matrix elements is sequentially performed by a two-stage tandem column setup using cation exchange and N-benzoyl-N-phenylhydroxylamine (BPHA) extraction resin. Elution of 0.1 mol L-1 HCl efficiently removes interfering elements such as Zr, Hf, Mo, and Cd in the final purified sample prior to ID-ICP-MS determination of PGE and Re. Analyses of BCR-723 yield reproducible results and well-defined average Pt, Pd, Os, Ir, Ru, and Re concentrations of 79.8 +/- 6.0, 4.6 +/- 0.8, 0.37 +/- 0.04, 0.23 +/- 0.12, 1.1 +/- 0.3, and 6.5 +/- 0.1 ng g(-1), respectively (95% confidence level; n = 10). The Os-187/Os-188 ratio of this standard was determined to be 0.537 +/- 0.022 (95% confidence level; n = 10). These are the first comprehensive PGE and Re concentrations and Os isotopic compositions reported for BCR-723 and provide a well-characterized standard for assessing the data quality of autocatatyst PGE measurements and related research on environmental materials. The method was successfully employed in the determination of PGE and Re concentrations and Os isotopic compositions in urban road dust samples.