Liquid waveguide capillary cell for the spectrophotometric determination of nanomolar iodate concentrations in marine waters

A new spectrophotometric method based on a liquid waveguide capillary cell for an enhanced detection was developed to measure nanomolar iodate concentrations.This method has a detection limit and precision of 1-2 nmol/L,which is equivalent to 10%that of conventional methods,a recovery of 97.7%-104.0%,and a working range of 10-120 nmol/L.Water samples were collected from three estuaries and one coastal ocean for testing,and the proposed technique detected as low as 11 nmol/L and 18 nmol/L iodate in these samples.This newly developed method is helpful in understanding the biogeochemical cycle of iodine in nature.

高灵敏钚价态分析仪的研制

利用液芯波导毛细管池(LWCC)和光纤技术,研制了高灵敏的钚价态分析装置。该装置小巧、便携,操作简单、快速。液芯波导毛细管池与光纤的应用,大大提高了仪器的灵敏度,并能够实现放射性样品的远距离分析。在对钚的价态分析中,Pu(Ⅲ)、Pu(Ⅳ)和Pu(Ⅵ)的测量精度分别达到2.3%、3.7%、5.6%,检出限为0.99、1.08、0.03mg/L,该装置在核燃料后处理钚价态的分析中具有一定的应用价值。

AA3连续流动分析仪测定挥发酚的可行性研究及优势

使用德国SEAL公司AA3型连续流动分析仪(配备100cm光程的液体波导毛细管流通池,LWCC)测定水中挥发酚,实验结果表明,方法线性关系好,相关系数≥0.9995;灵敏度高,检出限为0.15μg/L;精密性高,相对标准偏差(RSD)仅0.62%;准确度高,标准物质测定相对误差(RE)<3%,加标回收率达93.8%~107.5%,满足挥发酚测定相关要求。另外,与4-氨基安替比林分光光度萃取法相比,连续流动分析法操作简单、快速高效、灵敏度高、检出限低、稳定性高、实验过程易重现及追溯等特点,使其在低浓度、大批量样品分析中具有明显优势。