胶束增敏光度法测定微量氰化物的研究

根据CN^-对丁二酮肟-Ni-曲通X-100体系的增色作用，建立了一种测定微量氰化物的新方法。方法选择性好，操作简便，不需要蒸馏和萃取。CN-含量在0-0．32mg／L内符合比耳定律，用于环境水中氰化物的测定，结果满意。     

聚乙烯醇——乳化剂OP——聚乙二醇分光光度法测定湿沉降中硫酸盐

在硫酸钡浊度法测定硫酸盐和聚乙烯醇－聚乙二醇４００－乳化剂ＯＰ－氯化钡体系测定硫酸盐测试条件研究的基础上，研究了胶束增溶分光光度法硫酸盐的新方法。试验结果表明：硫酸盐浓度为０￣５０ｍｇ／ｌ时，曲线相关系数大于０．９９９，加标回收率为９４．６￣１０４．８％，相对标准偏差为２．２％。     

Simulating the injection of micellar solutions to recover diesel in a sand column

This paper presents numerical simulations of laboratory experiments where diesel, initially present at 18% residual saturation in a sand column, was recovered by injecting a micellar solution containing the surfactant Hostapur SAS-60 (SAS), and two alcohols, n-butanol (n-BuOH), and n-pentanol (n-PeOH). The micellar solution was developed and optimized for diesel recovery using phase diagrams and soil column experiments. Numerical simulations with the compositional simulator UTCHEM agree with the experimental results and show that the entire residual diesel in the sand column was recovered after the downward injection of 5 pore volumes of the micellar solution. Recovery of diesel occurs by enhanced solubility in the microemulsion phase and by mobilization. An additional series of simulations investigated the effects of phase transfer, alcohol partitioning, and component segregation on diesel recovery. These simulations indicate that diesel can be accurately represented in the model by a single component, but that the pseudo-component approach for active matter and the assumption of local phase equilibrium leads to an underestimation of diesel mobilization.     

Use of micellar liquid chromatography for rapid monitoring of fungicides post harvest applied to citrus wastewater

A method based on micellar liquid chromatography has been developed to simultaneously monitor four pesticides largely post-harvest applied to citrus:thiabendazole,pyrimethanil,o-phenylphenol and imazalil.Water samples were filtered and directly injected without other treatment,thus avoiding extraction steps.The composition of the mobile phase was optimized using a chemometrical approach to achieve and excellent resolution to 0.07 mol/L SDS/5%,V/V 1-pentanol buffered at p H 3.Mobile phase run through a C18 column at 1 m L/min at room temperature.The detection was performing by UV–Visible absorbance using a wavelength program:0–10 min,305 nm(for thiabendazole);10–12;265 nm(for pyrimethanil)and 12–18,220 nm(o-phenylphenol and imazalil).The developed method was validated following the guidelines of the US Environmental Protection Agency in terms of:quantitation range,(0.5–4 to 15μg/m L),linearity(r20.9995),sensitivity(LOD,0.18–1.4μg/m L),precision(9.2%),trueness(93.9%–103.7%),and ruggedness(9.9%).It was found that the fungicides remain up to eight days in surface water at outdoor conditions.The method was used to screen the presence of the analytes in several waste water samples,and was proved to be useful in routine analysis.     

毛细管胶束电动色谱柱端安培检测对氧磷、甲基对硫磷、乙基对硫磷、扑灭松

用毛细管胶束电动色谱柱端安培检测的方法对对氧磷、甲基对硫磷、乙基对硫磷、扑灭松等四种常见有机磷农药进行了分离检测,对缓冲液种类、离子浓度、pH值、胶束浓度、电极的检测电势等检测条件进行了最佳优化。结果表明,此方法对四种农药的质量检测限较气相色谱法低3～4个数量级,并将用于地表水样品的检测。