气相色谱法测定大豆油中有机氯农药残留的不确定度评定
目的 建立气相色谱法(gas chromatography, GC)测定大豆油中有机氯农药残留结果的不确定度评定的数学模型。方法 依据JJF 1059.1-2012《测量不确定度评定与表示》, 全面考虑测量过程中的不确定度来源, 对大豆油中有机氯农药残留的不确定度进行评定。结果 当取样量为1.0 g, k=2(置信度为95%)时, 检测出大豆油中六六六(hexachlorocyolohexane, HCH)和滴滴涕(dichlorodiphenyltrichloroethane, DDT)含量。α-HCH、β-HCH、γ-HCH、δ-HCH、o,p'-DDT和p,p'-DDT的含量分别为: (0.66±0.090)、(1.32±0.104)、(0.52±0.074)、(0.35±0.066)、(0.12±0.032)和(0.051±0.014) mg/kg。结论 GC法测定大豆油中有机氯农药残留的不确定度主要来源于测定结果重复性, 其次为标准工作液的配制及色谱峰面积引起的不确定度, 其他因素的影响相对较小。
Objective To evaluate the uncertainty of determination of organochlorine pesticide residues in soybean oil by gas chromatography (GC). Methods According to the JJF 1059.1-2012 Chinese regulation on the valuation and expression of uncertainty in measurement, the sources of uncertainty in determination of organochlorine pesticide residues in soybean oil were analyzed and assessed. Results When the sample was 1.0 g (k=2, 95% confidence), the content determination of α-HCH, β-HCH, γ-HCH, δ-HCH, o,p'-DDT and p,p'-DDT were (0.66±0.090), (1.32±0.104), (0.52±0.074), (0.35±0.066), (0.12±0.032), and (0.051±0.014) mg/kg, respectively. Conclusion The determination results of repeatability contribute predominantly to the uncertainty of organochlorine pesticide determination by GC, followed by the preparation of the standard wording fluid and the chromatographic peak area, and the influence of other factors are relatively small.
标题：气相色谱法测定大豆油中有机氯农药残留的不确定度评定
英文标题：Uncertainty evaluation of determination of organochlorine pesticide residues in soybean oil by gas chromatography
作者：
陈科 广东省食品检验所
中文关键词:不确定度,气相色谱法,有机氯农药残留,大豆油,
英文关键词:uncertainty,gas chromatography,organochlorine pesticide residues,soybean oil,
发表日期：2017-02-21
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