Department of Chemistry and Sophisticated Analytical Instrument Facility, Indian Institute of Technology Madras, Chennai, India.
J Environ Sci Health B. 2009 Sep;44(7):697-705. doi: 10.1080/03601230903163814.
The presence of parts per billion (ppb) levels of chlorpyrifos (O,O-Diethyl-O-(3,5,6-trichloro-2-pyridyl) phosphorothioate) and malathion (S-1,2-bis(ethoxycarbonyl) ethyl O,O-dimethyl phosphorodithioate), two common pesticides found in the surface waters of developing countries, have been visually detected using gold nanoparticles. Visual detection of the presence of pesticide is possible when the color change occurring by the adsorption of pesticides on gold nanoparticles is enhanced by sodium sulfate. The method presented here is simple and there is no need of sample preparation or preconcentration. The response occurs within seconds and the color change is very clear. The detection is possible if chlorpyrifos and malathion are present up to a concentration of 20 and 100 ppb, respectively. The method shows great potential for on-site pesticide monitoring. The method is also applicable as a qualitative technique for the performance evaluation of various household water filters, which claim pesticide removal.
使用金纳米粒子可以直观地检测到在发展中国家地表水存在的氯吡硫磷（O,O-二乙基-O-(3,5,6-三氯-2-吡啶基)硫逐磷酸酯）和马拉硫磷（S-1,2-双(乙氧羰基)乙基 O,O-二甲基硫代磷酸酯），这两种常见的农药。当农药在金纳米粒子上的吸附引起的颜色变化通过硫酸钠得到增强时，就可以直观地检测到农药的存在。这里所提出的方法简单，不需要样品制备或预浓缩。反应在几秒钟内发生，颜色变化非常明显。如果氯吡硫磷和马拉硫磷的浓度分别达到 20 和 100 皮克/升，则可以进行检测。该方法在现场农药监测方面具有很大的潜力。该方法还可作为各种家用水过滤器（声称可以去除农药）性能评估的定性技术。
