靛蓝胭脂红褪色光度法测定食盐中碘的研究

在酸性介质中,溴化钾存在下,碘酸根对靛蓝胭脂红有褪色作用,且褪色程度与碘酸根的量有关,从而建立了碘的光度测定新方法。方法的最大吸收波长在610nm 处,碘定量测定的线性范围为0～18μg/10ml。方法操作简单,快速、重现性好,用于加碘食盐中碘的测定,结果满意。     

结晶紫褪色分光光度法测定食盐中微量碘

在硫酸介质中和溴化钾存在下,碘酸根能使结晶紫氧化而褪色,且褪色的程度与碘酸根存在量成正比,从而建立了光度法测定碘的新方法.方法的最大吸收波长为630 nm.碘酸根含量在5～42μg/10 mL范围内符合比尔定律.表观摩尔吸光系数为1.1×104 L·mol-1·cm-1.将该方法用于测定加碘食盐中的微量碘,结果满意.     

亚甲基蓝褪色光度法测定食盐中微量碘

在硫酸介质中和溴化钾存在下,碘酸根能使亚甲基蓝氧化而褪色,且褪色的程度与碘酸根存在量成正比,从而建立了光度法测定碘的新方法.方法的最大吸收波长为545 nm.碘酸根含量在1～20μg /10 mL范围内符合比尔定律.表观摩尔吸光系数为1.0×104L·mol-1·cm-1.将该方法用于测定加碘食盐中的碘,结果满意.     

1-(2-吡啶偶氮)-2-萘酚(PAN)褪色光度法测定食盐中碘的研究

在酸性介质中,溴化钾存在下,碘酸根对1-(2-吡啶偶氮)-2-萘酚(PAN)有褪色作用,且褪色程度与碘酸根的量有关,从而建立了碘的光度测定新方法。方法的最大吸收波长在430nm处,碘定量测定的线性范围为0～18μg/25mL。方法操作简单,快速、重现性好,用于加碘食盐中碘的测定,结果满意。     

1-（2-呲啶偶氮）-2-萘酚（PAN）褪色光度法测定食盐中碘的研究

在酸性介质中，溴化钾存在下，碘酸根对1-（2-吡啶偶氮）-2-萘酚（PAN）有褪色作用，且褪色程度与碘酸根的量有关，从而建立了碘的光度测定新方法。方法的最大吸收波长在430nm处，碘定量测定的线性范围为0—18μg／25mL。方法操作简单，快速、重现性好，用于加碘食盐中碘的测定，结果满意。     

铬黑T氧化褪色光度法测定食盐中微量碘

本文研究了在硫酸介质中，碘酸根氧化铬黑T使其褪色的最佳条件，建立了测定微量碘的新方法。通过实验，测得最大吸收波长为510hm，碘测定碘的线性范围为0～1．0mg/L。本方法的相对标准偏差为0．24％～0．28％；回收率为98．7％～103．6％。用于测定食盐中微量碘，结果令人满意。     

靛蓝胭脂红氧化褪色光度法测定食品中微量碘

基于稀硫酸介质中,在溴化钾的催化下,碘酸根对靛蓝胭脂红有明显的褪色作用,且褪色的程度与碘酸根的含量有关,建立氧化褪色光度法测定微量碘的方法.碘定量测定的线性范围为20 μg/25 mL～50 μg/25mL,方法的检出限为1.25×10-1 μg/mL,反应的表观摩尔吸光系数为1.354 L/(cm·mol).本法的灵敏度和选择性较高,重现性好,操作简便,用于测定海带或食盐等含微量碘较高的食品,结果满意.     

靛蓝胭脂红氧化褪色光度法测定食盐中碘

研究了在稀硫酸介质与正催化剂溴化钾存在下,碘酸根对靛蓝胭脂红褪色条件,建立了氧化褪色光度法测定微量碘的方法。方法检出限为DL=3.31×10-2μg/mL,测定的线性范围为10~50μg/mL。该方法用于食盐中微量碘的测定,实验结果令人满意。     

甲酚红氧化褪色光度法测定海带中的微量碘

在硫酸介质中、在溴化钾催化条件下,碘酸根对甲酚红有褪色作用,且褪色的程度与碘酸根的量有关,碘定量测定的线性范围为20μg/25mL～50μg/25mL,检出限为6.57×10-1μg/25mL,回收率为98.1%～104.2%。该法重现性好、准确度高、操作简便,是测定海带中微量碘的一种较理想的方法。     

加碘食盐中碘含量的光谱分析

本文提出了在强酸性条件下，根据碘酸根氧化邻苯二酚紫使其褪色吸光光谱法测定加碘食盐中碘含量的分析方法。实验结果表明，在最大吸收波长557nm处，碘量在0～2．0μg／ml范围呈线性关系，方法回收率为101．2％～107．9％，变异系数小于0．86％。     

含碘废液中碘酸钾的回收

研究了含碘废液中的碘酸钾的回收方法。采用氯化钡为沉淀剂,浓硫酸为氧化剂,以氢氧化钾中和得到碘酸钾。结果表明该方法工艺操作简便,废液处理量大,回收速度快,所用试剂成本低廉、无毒,回收过程中无有害物质产生,对废液中碘的回收率达到90%以上,所得碘酸钾的纯度大于99%。     

Uptake by perennial ryegrass of iodide, elemental iodine and iodate added to soil as influenced by various amendments.

Perennial ryegrass was grown in pots in a sandy loam soil, into which iodide, elemental iodine or iodate had been incorporated at a rate of 20 mg I/kg. The uptake of iodine into the herbage was much greater from iodate than from the other two forms. Replacement of 5 % of the soil by well-decomposed farmyard manure reduced uptake from all three forms of iodine more than ten-fold. Similar replacement by chalk reduced uptake from iodide but increased uptake from iodate. The recovery of added iodine in three successive harvests of ryegrass ranged from 0.03% for elemental iodine in combination with soil + FYM to 2.16% for iodate in combination with soil + chalk.     

Determination of iodine species in milk using ion chromatographic separation and ICP-MS detection

A combination of ion chromatography (IC) and inductively coupled plasma-mass spectrometry (ICP-MS) was used to determine iodine species in Thuringian milk samples. The developed method allows the fast and sensitive determination of iodine species with limits of determination for iodide and iodate <2 µg/L. Iodide was identified as the main iodine species in milk, but in a few samples also traces of iodate and several unidentified, presumably organoiodine compounds were observed as well. In addition, the total iodine concentration in the samples was determined by ICP-MS and gives an idea about the actual iodine state in Thuringian milk.     

海藻碘盐补碘效果现场追踪观察结果分析

选择碘缺乏病人群、分三组试验,每日供给海藻碘盐,三个月后测定结果表明,合格海藻碘盐能起到有效的补碘作用,可起到碘酸钾碘盐同样的补碘效果。     

碘盐中碘酸钾与其它形态碘的分离

研究了采用分离剂将碘酸钾与以其它形态存在碘分离后,用现有的通用方法分别测定碘含量。从而确定碘盐中碘的存在形态。     

A novel approach for the simultaneous determination of iodide, iodate and organo-iodide for 127I and 129I in environmental samples using gas chromatography-mass spectrometry

In aquatic environments, iodine mainly exists as iodide, iodate, and organic iodine. The high mobility of iodine in aquatic systems has led to (129)I contamination problems at sites where nuclear fuel has been reprocessed, such as the F-area of Savannah River Site. In order to assess the distribution of (129)I and stable (127)I in environmental systems, a sensitive and rapid method was developed which enables determination of isotopic ratios of speciated iodine. Iodide concentrations were quantified using gas chromatography-mass spectrometry (GC-MS) after derivatization to 4-iodo-N,N-dimethylaniline. Iodate concentrations were quantified by measuring the difference of iodide concentrations in the solution before and after reduction by Na(2)S(2)O(5). Total iodine, including inorganic and organic iodine, was determined after conversion to iodate by combustion at 900 °C. Organo-iodine was calculated as the difference between the total iodine and total inorganic iodine (iodide and iodate). The detection limits of iodide-127 and iodate-127 were 0.34 nM and 1.11 nM, respectively, whereas the detection limits for both iodide-129 and iodate-129 was 0.08 nM (i.e., 2pCi (129)I/L). This method was successfully applied to water samples from the contaminated Savannah River Site, South Carolina, and more pristine Galveston Bay, Texas.     

Determination of iodide and iodate in edible salt by ion chromatography with integrated amperometric detection

Iodised salt compositions formulated with potassium iodate typically have iodate content of 20–40 ppm (μg/g) which translates to iodine content of 15–30 ppm. The technique of iodide estimation in brine by ion chromatography with amperometric detection was applied to iodate estimation in salt. The method involved reduction of iodate to iodide with excess sodium bisulphite followed by estimation of iodide. No other pre-treatment was necessary for iodate estimation in the concentration range of interest for iodised salt. Quantitative analysis was feasible for iodate concentrations ?5 ppm in salt. Iodised salt formulations containing iodide and iodate together were also analysed and the two constituents were quantified separately. Interferences from impurities normally present in salt were insignificant. An important advantage of the present method is that it eliminates the possibility of misleading results from potential adulterants which can impart positive iodometric test while, at the same time, keeping the analytical procedure simple.     

离子色谱-双波长紫外检测法同时测定水中碘酸盐和碘离子的含量

目的建立离子色谱-双波长紫外检测法同时测定水中碘酸盐和碘离子的分析方法。方法水样过0.22μm滤膜后直接进样测定,水中碘酸根和碘离子通过离子色谱柱分离,紫外检测器分别在200nm和226nm处检测。结果碘酸根和碘离子在0.01~1.00mg/L浓度范围内线性良好,相关系数r分别为0.99953和0.99950,检出限为0.004和0.005mg/L,相对标准偏差(relative standard deviations,RSDs)为2.8%和2.7%(n=8)。低(0.05mg/L)、中(0.10mg/L)、高(0.50mg/L)3个浓度IO_3~-和I~-加标回收率范围为94%~106%和92%~102%,精密度为1.04%~4.82%和0.75%~4.47%。结论本方法操作简单、准确度高、精密度好、线性范围宽,适用于水中碘酸盐和碘离子的测定。     

物理吸附法卤水脱碘技术的研究

目前,离子膜法制碱采用的原料卤(盐)水中往往含较高量的碘化物,电解时这些碘化物会以碘酸盐的形式沉淀,导致电流效率降低,离子膜寿命缩短。针对这个问题文章介绍了研究去除卤水中微量碘离子的过程。     

Fast and reliable salt iodine measurement: evaluation of the WYD Iodine Checker in comparison with iodometric titration

Iodine deficiency persists as the leading cause of preventable brain damage and reduced intellectual capacity in the world. The most effective method for the elimination of iodine deficiency is the consumption of adequately iodized salt. Ensuring that a population receives adequately iodized salt demands careful monitoring of the salt iodine content. We evaluated the WYD Iodine Checker, a hand-held instrument that quantitatively measures the salt iodine content on the basis of a colorimetric method, and compared its performance with iodometric titration. Performance testing results indicated that the WYD Iodine Checker is a highly precise, accurate, and sensitive tool for measuring salt iodine content. It is a user-friendly instrument that is based on a simple methodology and a straightforward salt sample preparation and testing procedure. We recommend further testing to examine the field performance of the WYD Iodine Checker when measuring iodate salt samples.