Department of Chemistry, Ilam University, Ilam, Iran.
Environ Monit Assess. 2013 Aug;185(8):7037-41. doi: 10.1007/s10661-013-3083-9. Epub 2013 Jan 13.
In this paper, a new spectrophotometric method is reported for the determination of nanomolar levels of Eriochrome black T in environmental samples. The method is based on the catalytic effect of silver nanoparticles on the oxidation of Eriochrome black T by hexacyanoferrate (III) in acetate-acetic acid medium and at 25 °C. The absorbance is measured at 512 nm with the fixed-time method. It relies on the linear relationship between the absorbance difference (∆A) and Eriochrome black T amounts in the range of 40-1,250 nM. Under optimum conditions, the sensitivity of the proposed method, i.e., the detection limit corresponding to 80 s, is about 25 nM. The method is featured with good accuracy and reproducibility for Eriochrome black T determination in river water samples without any pre-concentration and separation step.
本文报道了一种新的分光光度法，用于测定环境样品中纳米级别的 EBT（铬黑 T）。该方法基于银纳米粒子在醋酸-醋酸盐介质中，25°C 下对六氰合铁（III）氧化 EBT 的催化作用。采用固定时间法在 512nm 处测量吸光度。该方法基于在 40-1250nM 范围内吸光度差（∆A）与 EBT 量之间的线性关系。在最佳条件下，所提出方法的灵敏度（即 80s 对应的检出限）约为 25nM。该方法无需预浓缩和分离步骤，可用于河水样品中 EBT 的准确、重现测定。
