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首页> 外文期刊>Canadian Journal of Pure and Applied Sciences >APPLICATION OF A HYPHENATED FACILITY FOR SIMULTANEOUS SPECIATION STUDIES OF TOXIC OXIDATION STATES [Cr3+/Cr6+] AND [As3+/As5+] IN PRODUCED WATER FROM CRUDE OIL
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APPLICATION OF A HYPHENATED FACILITY FOR SIMULTANEOUS SPECIATION STUDIES OF TOXIC OXIDATION STATES [Cr3+/Cr6+] AND [As3+/As5+] IN PRODUCED WATER FROM CRUDE OIL

机译：加氢设施在原油粗制水中有毒氧化态[Cr3 + / Cr6 +]和[As3 + / As5 +]同时形成研究中的应用

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Produced water is the aqueous component of crude oil and has not been previously characterized for noxious oxidation states: Cr 3+ /Cr 6+ and As 3+ /As 5+ . It is often returned to the environment where it could create an unwanted hazard. It remains unexplored in this context largely because standard HPLC techniques do not permit convenient simultaneous separation of Cr 3+ /Cr 6+ and As 3+ /As 5+ due to proximity of corresponding retention times. Our group has adapted a facile process for rapid elution and concurrent mass separation of all four species in an affiliated HPLC/ICP-MS system equipped with a dynamic reaction cell (DRC). Oxygen gas was circulated through the DRC to remove interferences and enhance detection of the eluted components, especially the arsenic constituents. The stationary phase consisted of a C8 deactivated silica based column (length 150 mm; internal diameter: 4.6 mm; particle size: 5 μm); and the mobile phase was composed of a mixture of TBAH/EDTA in 2% methanol/water, adjusted to a pH of 7.2. The rate of elution was 1 mL/min; and recorded retention times (min) were: As 3+ : 1.81; As 5+ : 5.50; Cr 3+ : 1.83; and Cr 6+ : 5.74. The oxygen flow rate in the DRC was 0.7 mL/min. The Cr 3+ / Cr 6+ constituents were detected with m/z values of 52; the arsenic species coalesced with oxygen and were detected as adduct ions, AsO + , m/z, 91. Standard reference materials were deployed to test the competency of the analytical system. Typical recorded levels in the samples were: Cr 3+ : 0.5 – 20 mg/L; Cr 6+ /As 3+ /As 5+ : 1-5 μg/L. Our results were evaluated in terms of the potential source of toxicity of produced water to the environment. The significance of the study to petroleum and environmental science is discussed.
机译：采出水是原油的含水成分，以前没有针对有害的氧化态进行表征：Cr 3+ / Cr 6+和As 3+ / As 5+。它通常返回到可能造成有害危害的环境中。在这方面仍未进行探索，主要是因为标准HPLC技术由于相应的保留时间接近而无法方便地同时分离Cr 3+ / Cr 6+和As 3+ / As 5+。我们的小组采用了一种简便的方法，可以在配备有动态反应池（DRC）的附属HPLC / ICP-MS系统中对所有四个物种进行快速洗脱和同时质量分离。氧气循环通过DRC，以消除干扰并增强对洗脱组分（尤其是砷成分）的检测。固定相由C8失活二氧化硅基色谱柱（长度150 mm;内径：4.6 mm;粒径：5μm）组成;流动相由TBAH / EDTA在2％甲醇/水中的混合物组成，调节至pH值为7.2。洗脱速度为1 mL / min;记录的保留时间（分钟）为：As 3+：1.81; As 5+：5.50; Cr 3+：1.83; Cr 6+：5.74。 DRC中的氧气流速为0.7 mL / min。检测到的Cr 3+ / Cr 6+成分的m / z值为52;砷物质与氧聚结，被检测为加合物离子AsO +，m / z，91。部署了标准参考材料来测试分析系统的能力。样品中典型的记录水平为：Cr 3+：0.5 – 20 mg / L; Cr 6+ / As 3+ / As 5+：1-5μg/ L。我们根据采出水对环境的潜在毒性来源对结果进行了评估。讨论了该研究对石油和环境科学的意义。

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