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建立了四酸溶矿-电感耦合等离子体发射光谱法同时测定铬铁矿中铝、钙、镁、铁、钛、锰、钾、钠、钒、钴、镍的方法。本法在四酸溶矿基础上,用HClHCl O4除铬,使铬以氯化铬酰形式挥发除去,消除了铬在测定时对其它元素的干扰,同时弥补了碱熔时无法测定钾、钠的弊端。对试样的分解、铬干扰的消除、溶液中残存铬的影响及仪器参数进行了探讨研究。本法空白值低,检出限为1~48μg/g,方法 RSD(n=12)为0.93%~9.2%,相对误差为-8.2%~3.6%。通过一系列铬铁矿标准物质及实测样品进行方法验证,四酸溶矿测定值与碱熔的ICP-AES的测定值进行比对,结果均在误差范围内,满足地质矿产检测的要求。该法分析过程简单,避免了在溶矿过程中引入其它待测元素,因消除了铬的干扰,一套标准系列即可满足测试要求,实用性强,适合铬铁矿中钾、钠等元素的测定。
A method for the simultaneous determination of aluminum, calcium, magnesium, iron, titanium, manganese, potassium, sodium, vanadium, cobalt and nickel in chromite by tetra-acid dissolution-inductively coupled plasma-atomic emission spectrometry was established. This method is based on the four acid dissolution, with HClHCl O4 in addition to chromium, chrome chromogenic chromium volatilization removed, eliminating the interference of chromium in the determination of other elements, while making up for the alkali melting can not determine potassium, sodium The drawbacks. Decomposition of the sample, the elimination of chromium interference, residual chromium in solution and instrument parameters were studied. The method has a low blank value, the detection limit is 1 ~ 48μg / g, RSD (n = 12) is 0.93% ~ 9.2% and relative error is -8.2% ~ 3.6%. Through a series of chromite reference materials and samples tested to verify the method, the measured value of tetra-acid-lysine is compared with the measured value of alkali fusion ICP-AES, the results are within the error range to meet the requirements of geology and mineral testing. The method has simple analysis process and avoids introduction of other elements to be tested in the process of dissolving ore. Due to the elimination of the interference of chromium, a set of standard series can meet the test requirements and has strong practicability and is suitable for elements such as potassium and sodium in chromite The determination.