CAJ | 학술논문

目的探讨氧化还原滴定法检测川盐含碘量的可行性分析及其控制方法,用以提高检测质量.方法在四川省4个县(区)内抽取122份盐样,检测盐样中碘离子形态.省级和县级疾病预防控制中心实验室采用氧化还原滴定法检测盐样含碘量,对结果进行实验室间比对.省级疾病预防控制中心分别用氧化还原滴定法和溴水氧化滴定法检测盐样含碘量,对结果进行方法间比对.检测比较不同存放方式(敞口、封闭)和存放时间(第1、2、4、7、14、30、60天)次氯酸钠试剂中有效氯水平.结果川盐在运输和储存的过程中碘离子的形态可由碘酸根离子(103-)向碘离子(I-)转化;省级与县级疾病预防控制中心实验室氧化还原滴定法检测的122份盐样含碘量分别为(32.40±8.44)、(31.10±8.34)mg/kg,122对检测结果的数据差值为1.33 mg/kg,差值绝对值≤1 mg/kg的占18.8%(23/122),＞1～3 mg/kg的占23.0%(28/122),＞3～5 mg/kg的占23.0%(28/122),＞5～10 mg/kg的占26.2%(32/122),＞10 mg/kg的占9.0%(11/122).次氯酸钠开瓶后敞口和密闭存放60 d.有效氯水平分别下降43.6%和32.5%;氧化还原滴定法和溴水氧化滴定法检测的114份盐样含碘量分别为(32.60±8.44)、(32.50±8.18)mg/kg,两种方法检测结果比较,差异无统计学意义(t=0.282,P＞0.05).结论川盐在储运过程中碘酸钾可向碘化钾转化,在氧化还原滴定法检测川盐含碘量过程中,次氯酸钠的有效氯水平和用量影响较大且不易控制,推荐使用溴水氧化滴定法检测川盐含碘量.
목적 탐토양화환원적정법검측천염함전량적가행성분석급기공제방법,용이제고검측질량.방법 재사천성4개현(구)내추취122빈염양,검측염양중전리자형태.성급화현급질병예방공제중심실험실채용양화환원적정법검측염양함전량,대결과진행실험실간비대.성급질병예방공제중심분별용양화환원적정법화추수양화적정법검측염양함전량,대결과진행방법간비대.검측비교불동존방방식(창구、봉폐)화존방시간(제1、2、4、7、14、30、60천)차록산납시제중유효록수평.결과 천염재운수화저존적과정중전리자적형태가유전산근리자(103-)향전리자(I-)전화;성급여현급질병예방공제중심실험실양화환원적정법검측적122빈염양함전량분별위(32.40±8.44)、(31.10±8.34)mg/kg,122대검측결과적수거차치위1.33 mg/kg,차치절대치≤1 mg/kg적점18.8%(23/122),＞1～3 mg/kg적점23.0%(28/122),＞3～5 mg/kg적점23.0%(28/122),＞5～10 mg/kg적점26.2%(32/122),＞10 mg/kg적점9.0%(11/122).차록산납개병후창구화밀폐존방60 d.유효록수평분별하강43.6%화32.5%;양화환원적정법화추수양화적정법검측적114빈염양함전량분별위(32.60±8.44)、(32.50±8.18)mg/kg,량충방법검측결과비교,차이무통계학의의(t=0.282,P＞0.05).결론 천염재저운과정중전산갑가향전화갑전화,재양화환원적정법검측천염함전량과정중,차록산납적유효록수평화용량영향교대차불역공제,추천사용추수양화적정법검측천염함전량.
Objective To investigate the influential factors and the control measures thereof iodine salt detection with oxidation-reduction titration method so as to improve the detection quality.Methods 122 samples were obtained randomly from four counties(districts)of Sichuan Province to determine iodine ions forms.In center for diseases control and prevention(CDC)laboratories at the provincial and county levels,iodine contents in the samples were determined with oxidation-reduction titration and the results were compared between laboratories.The provineial lahoratory also employed bromine water oxidation for method comparison.Also the volume fractions of chlorine available were determined in sodium hypochlorite storage in open or sealed status and of different storage periods of 1,2,4,7,14,30 and 60 days.Results The iodine transformed from 103- to I-during the shipment and storage;The iodine contents in the 122 salt samples determined by the laboratories at the provincial and county levels were respectively(32.40±8.44),(31.10±8.34)mg/kg with a result discrepancy of 1.33 mg/kg.Of all the absolute discrepancy values,18.8%(23/122)were lower than or equal to 1 mg/kg;23.0%(28/122)were equal to or higher than 3 mg/kg;23.0%(28/122)were lower than or equal to 5 mg/kg;26.2%(32/122)were lower than or equal to 10 mg/kg;9.0%(11/122)were higher than 10 mg/kg.After the botdes were opened and stood for 60 days,the available chlorine content in the sodium hypochlorite decreased by 43.6%and 32.5%respectively in open and sealed status,Iodine contents were respectively(32.60±8.44),(32.50±8.18)mg/kg(n=114)with the oxidationreduction titration method and bromine water oxidation method,and no significant difierence was found between the results of the two methods(t=0.282,P＞0.05).Conclusions Potassium iodate in salt in Sichuan is Dmne to transform into potassium iodide during shipping,so when determining salt iodine with the oxidation-reduction titration method,the content and the amount of chlorine available in the sodium hypochlorite differ a lot and are difficult to control.Therefore.bromine water oxidation titration is recommended.