一种简单、稳定、高灵敏度的分光光度法测定纳米硅-半胱氨酸复合物存在下不同生物培养基中砷(III)的含量

Omar Alnasra, F. Khalili
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引用次数: 1

摘要

本文介绍了一种选择性和相当稳定的比色法,以毫微克/升(mg/L)为显色剂,测定各种水样和生物样品中纳米硅-半胱氨酸复合物的痕量砷。采用衰减全反射-傅里叶变换红外(ATR-FTIR)光谱分析对复合材料进行了表征。这种方法的新颖之处在于处理纳米二氧化硅的存在,这反映在获得透明溶液的困难上。测定了最大吸光度,Beer定律在As(III)浓度范围(0.75 ~ 5.00 mg/L)为590nm时呈线性关系。该方法的摩尔吸光度、桑德尔灵敏度和检出限均为6.00 × 105 L/mol。分别为8.55 × 10-2 μg/cm2和0.043 mg/L。对最佳反应条件和其他分析参数进行了评价。该方法成功地检测了多种水样和生物样中的砷。
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A Simple, Stable, and Highly Sensitive Spectrophotometric Method for the Determination of Arsenic(III) from Different Biological Media in the Presence of Nanosilica-Cysteine Composite
This paper describes a selective and fairly stable colorimetric approach to determine trace amounts of arsenic conjugated with nanosilica-cysteine composite in various aqueous and biological samples in milligram per liter (mg/L) using Leucocrystal Violet (LCV) as a chromogenic reagent. Attenuated total reflectance-Fourier-transform infrared (ATR-FTIR) spectroscopy analysis was applied to characterize the composite. Novelty of this method is dealing with the presence of nanosilica which is reflected in the difficulty of obtaining a clear solution. The maximum absorbance is measured and Beer's law shows linearity over the concentration range of (0.75 to 5.00 mg/L) of As(III) at 590 nm. The molar absorptivity, Sandell’s sensitivity, and detection limit of the method were found to be 6.00 × 105 L/mol.cm, 8.55 × 10-2 μg/cm2, and 0.043 mg/L, respectively. The optimum reaction conditions and other analytical parameters were evaluated. Arsenic was successfully detected in a variety of aqueous and biological samples using the proposed method.
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