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Two-stage probe atomization GFAAS for direct determination of trace Cd and Pb in whole bovine blood
Microchemical Journal ( IF 4.8 ) Pub Date : 2018-09-01 , DOI: 10.1016/j.microc.2018.05.033
Artyom V. Volzhenin , Natalya I. Petrova , Tatyana V. Skiba , Anatoly I. Saprykin

Abstract Graphite furnace atomic absorption spectrometry (GFAAS) is rarely used for direct trace analysis of whole blood because of strong interferences caused by the organic matrix. Especially it concerns bovine blood samples, containing more proteinaceous and lipid components in comparison with human blood. In our work, the novel two-stage probe atomization (TPA) technique for Cd and Pb determination by GFAAS in whole bovine blood with minimum sample pre-treatment has been developed. Making use of TPA and chemical modifier has eliminated matrix suppression and decreased the non-selective absorption level by several times. It allowed us to dispense with brief sample pre-treatment by a mixture of nitric acid and hydrogen peroxide (1:1) without autoclave digestion. The pyrolysis temperatures were 650 °C for Cd and 900 °C for Pb in the presence of Pd modifier. The analytical signal dependence on the number of concentrating cycles has been studied. The maximal number of capturing cycles was found (15 and 10 for Cd and Pb). Applying of multiple probe concentrating has additionally decreased the limits of detection (LODs) comparing with single TPA. The achievable LODs in optimized conditions were found to be 0.01 and 0.2 μg/L for Cd and Pb, respectively (3 s test). The accuracy of the proposed technique was confirmed by anodic stripping voltammetry (ASV). The relative standard deviation for 5.1 μg/L Cd and 26 μg/L Pb concentrations was 6.4% and 7.5%, respectively.

中文翻译:

用于直接测定全牛血中痕量 Cd 和 Pb 的两级探针雾化 GFAAS

摘要 石墨炉原子吸收光谱法(GFAAS)由于有机基质的强干扰,很少用于全血的直接痕量分析。特别是它涉及牛血样品,与人血相比,它含有更多的蛋白质和脂质成分。在我们的工作中,开发了一种新的两级探针雾化 (TPA) 技术,用于通过 GFAAS 在最少样品预处理的情况下测定全牛血中的 Cd 和 Pb。使用TPA和化学改性剂消除了基质抑制并将非选择性吸收水平降低了数倍。它使我们无需使用硝酸和过氧化氢 (1:1) 的混合物进行简单的样品预处理,无需高压釜消解。在 Pd 改性剂存在下,Cd 的热解温度为 650 °C,Pb 的热解温度为 900 °C。已经研究了对浓缩循环次数的分析信号依赖性。发现了最大捕获循环数(Cd 和 Pb 为 15 和 10)。与单个 TPA 相比,应用多探针浓缩还降低了检测限 (LOD)。发现在优化条件下可实现的 LOD 对 Cd 和 Pb 分别为 0.01 和 0.2 μg/L(3 秒测试)。阳极溶出伏安法 (ASV) 证实了所提出技术的准确性。5.1 μg/L Cd 和 26 μg/L Pb 浓度的相对标准偏差分别为 6.4% 和 7.5%。发现了最大捕获循环数(Cd 和 Pb 为 15 和 10)。与单个 TPA 相比,应用多探针浓缩还降低了检测限 (LOD)。发现在优化条件下可实现的 LOD 对 Cd 和 Pb 分别为 0.01 和 0.2 μg/L(3 秒测试)。阳极溶出伏安法 (ASV) 证实了所提出技术的准确性。5.1 μg/L Cd 和 26 μg/L Pb 浓度的相对标准偏差分别为 6.4% 和 7.5%。发现了最大捕获循环数(Cd 和 Pb 为 15 和 10)。与单个 TPA 相比,应用多探针浓缩还降低了检测限 (LOD)。发现在优化条件下可实现的 LOD 对 Cd 和 Pb 分别为 0.01 和 0.2 μg/L(3 秒测试)。阳极溶出伏安法 (ASV) 证实了所提出技术的准确性。5.1 μg/L Cd 和 26 μg/L Pb 浓度的相对标准偏差分别为 6.4% 和 7.5%。阳极溶出伏安法 (ASV) 证实了所提出技术的准确性。5.1 μg/L Cd 和 26 μg/L Pb 浓度的相对标准偏差分别为 6.4% 和 7.5%。阳极溶出伏安法 (ASV) 证实了所提出技术的准确性。5.1 μg/L Cd 和 26 μg/L Pb 浓度的相对标准偏差分别为 6.4% 和 7.5%。
更新日期:2018-09-01
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