排序方式: 共有35条查询结果,搜索用时 109 毫秒
11.
离子色谱法电化学检测复合甜味剂和饮料中的甜味素 总被引:6,自引:0,他引:6
提出了一种以离子色谱法分离,积分安培法检测复合甜味剂和饮料中甜味素的新方法。以DionexAS4A-SC柱为分离柱,27.5mmol.l^-1NaOH为淋洗液等度淋洗,积分安培电化学检测。 相似文献
12.
加速溶剂萃取技术及其在环境分析中的应用 总被引:15,自引:3,他引:15
加速溶剂萃取技术是一项新颖的样品前处理技术,通过升高温度与压力结合使用有机溶剂,可快速,有效地由基体中萃取各种欲测物。本文系统地阐述了该技术的基本原理,各种影响因子及其在环境分析中的应用。该法适用于固体和半固体样品的前处理。 相似文献
13.
Jiasheng Cao Liming Huang Chunli Zhao Shifen Xu Xiaodong Wang Liansheng Wang 《毒物与环境化学》2013,95(1-2):73-81
The solubilization of eight selected substituted indole compounds (SICs) by carboxymethyl‐β‐cyclodextrin (CMCD) in water is reported. The results show that their solubility was well improved in CMCD aqueous solution, and the stoichiometry of inclusion complex of the studied SICs with CMCD was 1: 1. The acute toxicity to Photobacterium phosphoreum of the investigated SICs in CMCD aqueous solutions was also investigated and was compared with that in water. The results show that the toxicity of five studied SICs decreased while the toxicity of the rest three SICs increased in CMCD aqueous solutions, but neither the increase nor the decrease was significant. 相似文献
14.
Determination of bromate and chlorinated haloacetic acids in bottled drinking water with chromatographic methods 总被引:2,自引:0,他引:2
Disinfection by-products of interest such as bromate, chlorate and chlorinated haloacetic acids in 10 representative brands of bottled drinking water were investigated with ion chromatography. With the developed method, the detection limits of the disinfection by-products were in sub-microgl(-1) level. It was observed that bromate, chlorate and dichloroacetic acid could be detected in some water samples. In the bottled natural water, the concentrations for the three compounds were 0.1, 0.9 and 0.6 microgl(-1), respectively. The total concentration of disinfection by-products in the natural water sample was the highest among all the bottled drinking waters. The concentrations for the sum of disinfection by-products in the four types of bottled drinking water investigated were natural water > mineral water > spring water > purified water. The generation of disinfection by-products was much influenced by the original components and process procedure of the source water. The concentrations of bromate and chlorate in the bottled water samples hardly degraded with the increasing storage time. For dichloroacetic acid, with the prolonging of storage time, the concentration was much decreased. 相似文献
15.
土壤和植物中硼酸的离子排斥色谱法分析研究 总被引:1,自引:0,他引:1
本文研究了用酒石酸-甘露醇作淋洗液,氢氧化钠作再生液测定土壤和植物中硼酸的离子排斥色谱条件。硼酸的检测限为0.05mg/l相对标准偏差1.85%,样品测定回收率为100±10%。 相似文献
16.
三氮的离子色谱法连续测定研究 总被引:3,自引:0,他引:3
本文首次提出用电导检测器和紫外检测器串联,对氮的三种形态(N-NO_2~-,N-NO_3~-,N-NH_4~+)进行连续测定;盐酸/甘氨酸作淋洗液,HPIC-CS_5作分离柱,建立了同时测定“三氮”灵敏的色谱方法,方法的线性相关系数大于0.999,各离子的相对标准偏差均小于0.5%,对样品的测定,回收率均在100%%+5%以内,与标准方法比较,结果颇为一致。 相似文献
17.
18.
19.
离子色谱法中高浓度盐基体对无机阴离子分析影响规律的研究 总被引:5,自引:0,他引:5
本文首次研究高浓度盐基体中,大量盐的存在对无机阴离子的保留时间,峰高峰面积等参数的影响规律,并对其影响机理进行了初步探讨,实验证明,在样品中离子总浓度不超过柱容量孤情况下,虽然由于某些离子的浓度过高,使待测离子的保留时间变短,峰形改变,但用峰面积和标准加入外推法计算,仍可得到较即的结果。 相似文献
20.
离子色谱在饮用水消毒副产物及高氯酸盐分析中的应用 总被引:3,自引:0,他引:3
介绍了离子色谱在饮用水中消毒副产物及高氯酸盐分析中的应用。重点介绍了离子色谱测定饮用水中溴酸盐和高氯酸盐的方法。简单介绍了卤代乙酸和氯酸盐的离子色谱测定法及离子色谱-质谱联用技术在饮用水消毒副产物及高氯酸盐分析中的应用。 相似文献