摘要:
选用王水、氢氟酸、高氯酸、盐酸对红土镍矿石样品进行溶样试验,结果表明采用王水溶解,氢氟酸助溶,高氯酸冒烟除去氢氟酸的溶样方法较好;用盐酸溶解盐类,电感耦合等离子体发射光谱法测定溶液中镍、铬、镁、铝、钴元素,对目标元素进行了光谱干扰考察,选择了合适的分析谱线,结果表明铁会使目标元素谱线背景强度增高,采用在混合标准溶液中加入与样品中含量相当的铁可以消除基体干扰;除铬元素外其他目标元素加标回收率在96.83％~105.23％,相对标准偏差小于3.3%。建立的方法应用于标准样品分析,除铬元素外的其他元素测定值与标准值吻合较好。铬元素回收率较低,有待进一步研究。
关键词:
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等离子体发射光谱法
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红土镍矿
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镍
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铬
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镁
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铝
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钴
Abstract:
The different acid systems of aqua regia, HF+HClO4 and HCl were chosen for dissolving tests for Ni-bearing laterite samples. Results indicated that using aqua regia to dissolve samples with the support of HF acid and adding HClO4 acid to remove HF, is an ideal method for Ni-bearing laterite. The sample solution was dissolved by HCl before loading to determine Ni, Cr, Mg, Al and Co by inductively coupled plasma emission spectrometry (ICP-MS). The right analytical spectral lines were chosen after studying the spectral interferences for the selected elements. Test results demonstrated that Fe can increased the background intensity of the selected elements' spectral lines. The addition of the same amount of Fe with samples in mixed standard solution can eliminate matrix interference. Experimental results show that the recovery factors of Ni, Mg, Al and Co were 96.83%-105.23% with a relative standard deviation(RSD) of less than 3.3%, except Cr. The element determination results (except Cr) were in good agreement with certified values of standard materials. A further study is necessary for the low recovery of Cr.
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