排序方式: 共有73条查询结果,搜索用时 15 毫秒
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利用自制微型化学实验仪器,通过微型滴定法测定自来水中Cl-的含量.实验表明这种微型测定方法具有简便经济,反应灵敏,快速准确的特点.值得在化学实验教学中推广. 相似文献
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采用离子色谱电导检测法测定皮革制品中Cr(Ⅳ),选用Metrohm86I型离子色谱仪,Metrosep A Supp5—150型阴离子分析柱,12.8mmol/LNa2C03+4.0mmol/LNaHC03淋洗液.在10~100μg/L范围内,Cr(Ⅳ)的浓度与色谱峰面积呈线性关系,线性方程为C×100—2893.72×A+200.136,相关系数为0.9990,最低检测浓度为4μg/L,低、中、高三个浓度的精密度分别为1.60%、1.05%、0.65%,样品加标回收率分别为91.5%、93.6%和92.3%,本方法可用于皮革中Cr(Ⅵ)的测定. 相似文献
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设计合成了一种基于偶氮水杨醛的酰腙类探针分子,利用紫外-可见(UVVis)吸收光谱考察了其对Fe3+、Hg2+、Ag+、Ca2+、Cu2+、Co2+、Ni2+、Cd2+、Pb2+、Zn2+、Cr3+和Mg2+等12种阳离子的识别作用。结果表明,该探针在DMSO/H2O(体积比8/2)的含水体系中,对Cu2+具有专一选择性比色识别效果;且当加入Cu2+时,溶液颜色立刻由无色变为黄色,而加入其它阳离子则无变化,说明该探针能够实现对Cu2+裸眼检测。 相似文献
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Determination of fluorinated quinolone antibacterials by ion chromatography with fluorescence detection 总被引:1,自引:0,他引:1
For preparing fluorinated quinolone antibiotic medicine locally used in stomatology, simultaneous determination of norfloxacin, ciprofloxacin, and enoxacin was carried out by multiphase ion chromatography with fluorescence detection. Quinolone antibiotics were separated by Dionex OmniPac PAX-500 column with an eluent of 15 mmol/L H2SO4 and 35% methanol (v/v) at a flow-rate of 1.0 ml/min and detected with fluorescence with excitation and emission wave lengths of 347 ran and 420 ran respectively. The detection limits (S/N=3) of norfloxacin, ciprofloxacin and enoxacin were 50, 105 and 80 ng/ml respectively. The relative standard deviations of retention time, peak area and peak height were less than 1.1% and good linear relationship resulted. The developed method was applied to pharmaceutical formulations and biological fluids. 相似文献
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针对惠州市各县区水环境监测的现状,结合近期水环境监测资料和水污染事件案例进行分析,指出离子色谱在水环境监测中的实用价值,并在此基础上提出了离子色谱对推进惠州市水环境监测、水资源保障规划及工程建设、保障供水安全具有重要意义。 相似文献
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A new configuration integrated ion exchange effect with both electro-migration and electrochemical reaction in a single cell was developed to effectively retrieve metal ions from simulated wastewater using ion exchange resins without additive chemicals. By simply assembling cation exchange resins and anion exchange resins separated by homogeneous membranes, we found that the system will always be acidic in the concentrate compartment so that ion exchange resins could be in-situ regenerated without hydroxide precipitation. Such a realizable design will be really suitable for wastewater purification. 相似文献
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离子注入聚醚砜薄膜的导电特性研究 总被引:1,自引:0,他引:1
岳喜成 《南阳师范学院学报》2003,2(9):37-40,45
用15keV的N^ 和Ar^ 注入PES,纯PES膜表面电导率提高了5个数量级,掺碘PES膜表面电导率提高4个数量级。表面电导率随剂量的变化关系具有饱和性。掺碘使未注入的PES膜表面电导率提高近一个数量级,掺碘对提高注入离子的PES膜的表面电导率作用不大。在低剂量时,注Ar^ 样品的表面电导率大于注N^ 样品的表面电导率。在最高剂量时,表面电导率和注入离子的种类无关。离子注入PES膜的表面电导率在空气中非常稳定。在0~30V范围内,离子注入PES膜的表面电导率随电压的增加而缓慢增加。 相似文献