YTC (Yazaki Technology Center) America Inc., Camarillo, California 93012, United States.
Anal Chem. 2012 Jul 17;84(14):6122-7. doi: 10.1021/ac301018y. Epub 2012 Jun 25.
Sulfur anions and their derivatives have long been recognized for their high selectivity and reactivity toward Pb(2+) ions and formation of highly absorptive yet water-insoluble compounds with both acid and base media. This phenomenon has been used for qualitative analysis of lead ions in water. We demonstrate a new method to quantitatively determine the Pb(2+) concentration in the range of 0.5-500 ppm in water using colorimetric measurement, based on forming "soluble" lead sulfide in water enhanced with non-precious-metal nanoparticles. This method has inherent high selectivity for lead over other alkali-metal and alkaline-earth-metal ions. The colorimetric measurements of the absorptive solutions provide accurate determination of the lead concentration in water comparable to that measured using inductively coupled plasma mass spectrometry. To our knowledge, this is the simplest, lowest cost, and easiest-to-use method for detecting and determining the lead concentration in water.
硫阴离子及其衍生物因其对 Pb(2+)离子的高选择性和反应活性，以及在酸和碱介质中形成高吸收但不溶于水的化合物而被长期认可。这一现象已被用于水相中铅离子的定性分析。我们展示了一种新的方法，通过在水中形成非贵金属纳米粒子增强的“可溶”硫化铅，利用比色测量来定量测定水中 0.5-500ppm 范围内的 Pb(2+)浓度。该方法对 Pb(2+)具有固有高选择性，优于其他碱金属和碱土金属离子。吸收溶液的比色测量可提供与电感耦合等离子体质谱法测量相当的水中 Pb(2+)浓度的准确测定。据我们所知，这是检测和确定水中 Pb(2+)浓度最简单、成本最低、使用最简便的方法。
