石墨炉原吸收光谱法测定化探样品中超痕量铂钯

doi:10.11720/wtyht.2018.1362

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Abstract

This paper presents a method for the determination of ultra-trace platinum and ultra-trace palladium in rock ore by graphite furnace atomic absorption spectrometry after extraction from phenylthiourea-octanol. The conditions for extraction of platinum and palladium, the interference of co-existing ions and the optimum instrumentation conditions were studied. The liquid phase extraction was conducted after the sample was dissolved by aqua regia, and then the sample test was measured in the organic phase. The detection limit of platinum and that of palladium were 0.5×10 ^-9 and 0.1×10 ^-9. The relative standard deviations of the method were 6.0% and 4.7%, respectively, for eight samples with platinum 14.7×10 ^-9 and palladium15.2×10 ^-9 from the repeated sampling and dissolution. The relative standard deviations are 6.0% and 4.7% respectively, showing relatively good analytical quality.

Key words： platinum palladium phenyl thiourea octyl alcohol ultra-trace analysis

Received: 08 August 2017 Published: 24 October 2018

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	Dong-Chao GUAN

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Dong-Chao GUAN. The application of graphite furnace atomic absorption spectrometry to determination of ultra-trace platinum and ultra-trace palladium in rock ore[J]. Geophysical and Geochemical Exploration, 2018, 42(5): 1054-1058.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2018.1362 OR https://www.wutanyuhuatan.com/EN/Y2018/V42/I5/1054

元素	$PTU 体积 mL$	回收率/%	元素	$PTU 体积 mL$	回收率/%
Pt	0.1	93.3	Pd	0.1	92.2
	0.2	94.2		0.2	94.4
	0.3	95.7		0.3	94.7
	0.5	99.6		0.5	98.7
	1.0	99.1		1.0	99.1
	2.0	99.4		2.0	98.8
	3.0	98.7		3.0	99.2
	4.0	98.9		4.0	99.1

元素	$PTU 浓度 g / L$	回收率/%	元素	$PTU 浓度 g / L$	回收率/%
Pt	2	93.2	Pd	2	94.4
	5	94.6		5	95.7
	10	99.1		10	98.6
	15	99.2		15	99.5
	20	98.5		20	98.6
	25	99.3		25	99.1

加入的铂含量/ng	$测定值 ng$	$回收率 %$	加入的钯含量/ng	$测定值 ng$	$回收率 %$
50	50.1	100	50	49.9	99.8
100	100.0	100	100	99.2	99.2
500	495.4	99.1	500	490.5	98.1
1000	984.9	98.5	1000	979.2	97.9
2000	1954.0	97.7	2000	1953	97.6

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