【摘要】 在自制的电解液阴极大气辉光放电原子发射谱(ELCAD-AES)装置上,研究了钙镁标准溶液的特征发射光谱,定量检测了Mg和Ca的含量,两元素的检出限分别为0.2mg/L和0.8mg/L。通过准确性和加标回收实验,以及与乙二胺四乙酸二钠盐络合滴定(EDTA滴定)法测量结果的比较,证明了ELCAD-AES方法测量水硬度的可靠性。测定了沸腾前后的自来水和地下水,以及湖水中Mg和Ca的含量,获得了这些水样的硬度。所建立的ELCAD-AES方法可用于水体硬度或金属元素的快速在线监测。更多还原

【Abstract】 An electrolyte cathode atmospheric glow discharge atomic emission spectroscopy( ELCAD-AES) has been developed to determine the hardness of water. By the standard curves of Mg and Ca,the concentration curves of Mg and Ca measurement were obtained. The limits of detection of Mg and Ca were 0. 2 and 0. 8 mg/L,respectively. The precision and recovery were experimentally elucidated,which indicated that the homemade ELCAD-AES system has a good performance. Finally,practical water samples such as tap water, boiled tap water,ground water,boiled ground water and lake water were analyzed by the method. The results were in agreement with those by the EDTA titration. This demonstrates that ELCAD-AES has the capacity for on-line determination of water hardness.更多还原