Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Dec;116:132-5. doi: 10.1016/j.saa.2013.07.019. Epub 2013 Jul 23.
An optical detection method based on the interaction of gold nanoflowers with Hg(2+) and Pb(2+) has been described. After interaction, gold nanoflowers change the color from violet to wine red. The nanoflowers are capable of determining Hg(2+) and Pb(2+) over a dynamic range of 1.0 × 10(-6) and 1.0 × 10(-5)M, respectively. The response time of nanoflowers depends on the concentration of ions. The presence of both Hg(2+) and Pb(2+) ions in the mixture having Au nanoflowers induced color changes of the solution within several seconds even at 1.0 × 10(-6)M. Common metal ions were chosen to investigate their interference in Hg(2+) and Pb(2+) detection, and the concentration of each metal ion studied was 1.0 × 10(-5)M. Other metallic ions could not induce color change even at 1.0 × 10(-5)M. The feasibility of our method to detect Hg(2+) and Pb(2+) ions at high concentration in real water samples was verified. Water samples were from our own laboratory and no pretreatment was made. As the particles are stable they can be used for more than 3 months without observing any major deviation.
一种基于金纳米花与 Hg(2+)和 Pb(2+)相互作用的光学检测方法已经被描述。相互作用后，金纳米花的颜色从紫色变为酒红色。纳米花能够分别在 1.0×10(-6)和 1.0×10(-5)M 的动态范围内测定 Hg(2+)和 Pb(2+)。纳米花的响应时间取决于离子的浓度。在 Au 纳米花存在的混合物中，即使在 1.0×10(-6)M 时，两种离子的存在也能在几秒钟内引起溶液颜色的变化。选择常见的金属离子来研究它们对 Hg(2+)和 Pb(2+)检测的干扰，每种金属离子的浓度均为 1.0×10(-5)M。即使在 1.0×10(-5)M 时，其他金属离子也不能引起颜色变化。该方法在实际水样中高浓度检测 Hg(2+)和 Pb(2+)离子的可行性已经得到验证。水样取自我们自己的实验室，未进行任何预处理。由于颗粒稳定，在不观察到任何重大偏差的情况下，它们可以使用超过 3 个月。
