摘要
通过在显色反应体系中加大乙醇的使用量,改进了二乙基二硫代氨基甲酸钠测定溶液Cu^(2+)溶度的方法,使用NH3-NH4Cl缓冲溶液保证了反应体系稳定在pH=8~10,铜试剂与Cu2+完全显色的摩尔比为3∶1,显色反应生成的橘黄色物质稳定均一的存在于反应体系中,不需要萃取,可直接进行分光光度法的检测,在波长λ=452nm处的有效地检测范围为0.011~0.071mmol·L-1,符合朗伯-比尔定律,线性相关系数是0.9993。以柠檬酸铵作为掩蔽剂,杂质金属离子在一定浓度范围内的干扰可以得到消除。该方法避免了使用CCl4等有毒萃取溶剂,也简化了操作步骤,提高了测定的准确度,使得检测方法更加绿色快捷高效。
By increasing the amount of ethanol used in the color reaction system, the method for determining the solubility of copper ions in solution by sodium diethyldithiocarbamate was improved. The NH3-NH4 Cl buffer solution was used to ensure the stability of the reaction system at pH=810. The molar ratio of the copper reagent to the complete coloration of the copper ion is 3∶1, and the orange substance formed by the color reaction is stable and uniform in the reaction system, and does not require extraction, and can be directly detected by spectrophotometry at the wavelength λ=452 nm. The effective detection range is 0.0110.071 mmol·L^-1, which is in accordance with Lambert-Beer law, and the linear correlation coefficient is 0.9993. With ammonium citrate as a masking agent,interference of impurity metal ions in a certain concentration range can be eliminated. The method avoids the use of toxic extraction solvent such as CCl4, simplifies the operation steps, improves the accuracy of the measurement, and makes the detection method greener, faster and more efficient.
作者
孙德志
孙怡
秦占斌
高杰
高筠
SUN De-zhi;SUN Yi;QIN Zhan-bin;GAO Jie;GAO Yun(College of Chemical Engineering, North China L niversity of Science and Technology, Tangshan 063210, China)
出处
《化学工程师》
CAS
2019年第3期70-73,40,共5页
Chemical Engineer
基金
河北省自然科学基金项目(E2017209175)
关键词
分光光度法
铜离子
铜试剂
线性回归
spectrophotometry
copper ions
copper reagent
linear regression