气相色谱法测定矿泉水中的碘化物.pdf

第7卷第12期
食品安全质量检测学报
Vol. 7 No 12
2016年12月
ournal of Food Safcty and Qualily
I)cc..2016
气相色谱法测定矿泉水中的碘化物
刘立萍,陈卫强,罗丹,郦明浩,龙顺荣,唐穗平,刘付建”
广东产品质量监督检验研究院,国家食品质量监督检验中心(广东)佛山528300)
摘要:目的建立气相色谱法測定矿泉水中碘化物的含量。方法矿泉水样品中的碘化物在酸性条件下与
丁酮反应生成碘代丁酮衍生物、经毛细管柱RIX-5分离,采用电子捕获检测器检测,以外标法定量。结果碘
化钾在()-0.2 ugm!.浓度范围内线性关系良好,相关系数为0.9977,检出限为0.00lmg/l,6次重复测定的精密
度为0.878%,在0.02、0.05和0.1ug3个加标水平下,样品加标回收率为90.5%~92.8%。结论该方法的检出
限和精密度均符合要求.线性关系和回收率满意,方法可行
关键词:气相色谱法;矿泉水;碘化物
Determination of iodide in mineral water by gas chromatography
LIU Li-ping, CHEN Wci-qiang, LUO Dan, LI Ming-hao, LONG Shun-rong, TANG Sui-ping
LIU Fu-jial
(Guangdong esting Institute Qf Product uality upervision, China National Quality Supervision and Testing Center
for Foods ( Gucmngdong), Foshan 528300, China)
ABSTRACT Objective To establish a mcthod for dctermination OT' iodide in mincral waler by gas chromatography
((ic). Mcthods Under acidic condition, the reaction of iodide in mincral water with butanone generated iodine
generation o! butanone, thc ramification was separated by RTX-5 column, and detected by clectron capturc delector
(ECD)with external standard method for quantitation. Results The iodine generation o[ butanone had a good linear
elationship in the range o[ 0-0.2 ugml, with the correlation coeficient of.9977. Ihe Iimil of detection was 0.001
mg/L, and the precision was 0.878%0(n-6). The recovery rates o[ samples spiked al 3 levels o10.02, 0.05 and 0.1 H
were 90.5%0-02.8%. Conclusion The detection limit and precision can meet the requirements of detection, and the
lincar relalionship and recovcry are satis Factory, so the established mcthod is fcasiblc
KEY WORDS: gas chromatography; mineral water; iodide
与此同时高剂量碘摄入也可引起甲状腺肿、因此食品中碘
的分析是人们极为关注的问题,
碘是具有重要生物效应的微量元素之一,与人体的
目前碘的测定方法很多、包括碱灰化砷铈催化分光
生长发育、新陈代谢密切相关川。食品中的碘多是以碘酸
光度法阿、容量分析法、催化比色法、离子选择性电极
钾、碘化钾及海藻类等形式进行强化。1994年以后全国陆
法8、射线荧光光谱法、阴极溶出伏安法?、离子色
续推行加碘盐,至2002年全国加碘盐的覆盖率达95.2%21昔法、中子活化法り、电感耦合等离子体质谱法和气
基金项目:广东省质量技术监督局科技项目(2015CZ09,2016C7Z07)
Fund: Supporled by Administration o Quality and Technology Supervision of Guangdong Province (2015C709, 2016C707)
通讯作者:刘付建高级工程师,主要研究方向为涂料化工、食品家具检测。T-mail:liuyuan(a126.com
orresponding author: LIU Fu-jian, Snior Enin Guan on sin Insti of ct Quality Supervision Foshan 528300, hina. E-mal
liufuiian(c126.com.
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