ICP-MS和GFAAS测定粮食中镉的对比研究
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摘要
采用电感耦合等离子体质谱法(ICP-MS)与石墨炉原子吸收法(GFAAS)测定粮食中镉的含量,为粮食中镉元素的检测提供可靠依据。通过ICP-MS法与GFAAS法对粮食中镉的测定,并对两种方法线性范围、检出限、准确性、稳定性、加标回收率、检测时间进行对比。结果表明:ICP-MS法检出限低于GFAAS法,并且不同粮食作物检出限不同;GFAAS法和ICP-MS法测定大米粉标准物质,结果分别为0.490 mg/kg和0.474 mg/kg,均在标准值范围内;对不同粮食作物镉的重复检测,GFAAS法的检测结果均高于ICP-MS法,相对标准偏差(RSD)均在10%以内;加标回收率均在95%~105%之间。与GFAAS法相比,ICP-MS法具有更低的检出限,更宽的线性范围和更快的分析速度,其准确性和稳定性也可以满足粮食中镉的检测要求,是值得推广应用的一种检测方法。
The content of cadmium in grain was determined by inductively coupled plasma mass spectrometry( ICP-MS) and graphite furnace atomic absorption spectrometry( GFAAS),which provided a reliable basis for the detection of cadmium in grain. The linear range,detection limit,accuracy,stability,recovery rate and detection time of the two methods were compared. The results showed that the detection limit of ICP-MS was lower than GFAAS,and the detection limits of different grains were different. For the reference material of rice flour,the results were 0. 490 mg/kg by GFAAS and 0. 474 mg/kg by ICP-MS,and all of them were in the range of standard value. Repeated detection of cadmium in different grains,the results by GFAAS were higher than the results by ICP-MS,the relative standard deviation( RSD) of the two methods were less than 10%. The recovery rate of the two methods were between95% ~ 105%. Compared with GFAAS,ICP-MS has a lower detection limit,a wider linear range and faster analysis which accuracy and stability can also meet the requirements of cadmium detection in grain,and it is a detection method worth promoting application.
The content of cadmium in grain was determined by inductively coupled plasma mass spectrometry( ICP-MS) and graphite furnace atomic absorption spectrometry( GFAAS),which provided a reliable basis for the detection of cadmium in grain. The linear range,detection limit,accuracy,stability,recovery rate and detection time of the two methods were compared. The results showed that the detection limit of ICP-MS was lower than GFAAS,and the detection limits of different grains were different. For the reference material of rice flour,the results were 0. 490 mg/kg by GFAAS and 0. 474 mg/kg by ICP-MS,and all of them were in the range of standard value. Repeated detection of cadmium in different grains,the results by GFAAS were higher than the results by ICP-MS,the relative standard deviation( RSD) of the two methods were less than 10%. The recovery rate of the two methods were between95% ~ 105%. Compared with GFAAS,ICP-MS has a lower detection limit,a wider linear range and faster analysis which accuracy and stability can also meet the requirements of cadmium detection in grain,and it is a detection method worth promoting application.
引文
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[4]刘宏伟,谢华林,聂西度.ICP-MS法测定苦杏仁中微量元素的研究[J].光谱学与光谱分析,2013,33(5):1354-1356.
[5]邹可可,彭博.原子吸收光谱法在测定水中重金属的应用[J].世界有色金属,2016(15):115-116.
[6]沈宁宁,于成卓,李苗.AAS法、ICP-MS法以及ICP-OES法测定铅的比较[J].中国资源综合利用,2015,33(12):19-21.
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