多成分盐中碘酸钾及硫代硫酸盐的分析检测

在弱酸性介质中,利用间接碘量法消除还原物的干扰,于酸性条件下采用直接碘量法测定碘酸钾含量.根据硫代硫酸钠的还原性,以甲醛消除亚硫酸盐的干扰,加过量碘,间接法测定硫代硫酸钠.     

甲基橙氧化褪色光度法测定微量碘的研究

基于硫酸介质中,碘酸根在溴化钾的催化作用下对甲基橙有较好的氧化褪色作用。建立了分光光度法测定微量碘的新方法.最大吸收波长为508 nm,表现摩尔吸光系数为3.13×104L/(mol.cm),线性范围为在0~50μg/(50 mL)。用于食品中碘的测定,获得满意结果。     

Sodium-Iodate Injection Can Replicate Retinal Degenerative Disease Stages in Pigmented Mice and Rats: Non-Invasive Follow-Up Using OCT and ERG

Purpose: The lack of suitable animal models for (dry) age-related macular degeneration (AMD) has hampered therapeutic research into the disease, so far. In this study, pigmented rats and mice were systematically injected with various doses of sodium iodate (SI). After injection, the retinal structure and visual function were non-invasively characterized over time to obtain in-depth data on the suitability of these models for studying experimental therapies for retinal degenerative diseases, such as dry AMD. Methods: SI was injected into the tail vein (i.v.) using a series of doses (0–70 mg/kg) in adolescent C57BL/6J mice and Brown Norway rats. The retinal structure and function were assessed non-invasively at baseline (day 1) and at several time points (1–3, 5, and 10-weeks) post-injection by scanning laser ophthalmoscopy (SLO), optical coherence tomography (OCT), and electroretinography (ERG). Results: After the SI injection, retinal degeneration in mice and rats yielded similar results. The lowest dose (10 mg/kg) resulted in non-detectable structural or functional effects. An injection with 20 mg/kg SI did not result in an evident retinal degeneration as judged from the OCT data. In contrast, the ERG responses were temporarily decreased but returned to baseline within two-weeks. Higher doses (30, 40, 50, and 70 mg/kg) resulted in moderate to severe structural RPE and retinal injury and decreased the ERG amplitudes, indicating visual impairment in both mice and rat strains. Conclusions: After the SI injections, we observed dose-dependent structural and functional pathological effects on the retinal pigment epithelium (RPE) and retina in the pigmented mouse and rat strains that were used in this study. Similar effects were observed in both species. In particular, a dose of 30 mg/kg seems to be suitable for future studies on developing experimental therapies. These relatively easily induced non-inherited models may serve as useful tools for evaluating novel therapies for RPE-related retinal degenerations, such as AMD.     

浅析食用盐中碘剂的应用

主要介绍了我国食用碘盐的发展,并对作为补碘剂的碘化钾、碘酸钾和海藻碘进行比较。     

电导滴定法测定加碘盐中碘酸钾含量

以Ｂａ（ＯＡｃ）２为滴定剂,对ＫＩＯ３溶液进行电导滴定,利用电导率的演变来确定终点,通过计算求得ＫＩＯ３的浓度,检测下限为２．５×１０－５ｍｏｌ·Ｌ－１。最佳条件下的相对误差为－０．４％,此法成功地测定了加碘盐中的碘含量     

碘酸钾生产工艺的改进

阐述了碘酸钾生产工艺中长路和短路并存氯气处理、中和釜不进行中和操作等工艺改进措施,并已在生产实践中证实其切实可行。     

离子色谱—电感耦合等离子体质谱联用测定婴幼儿配方乳粉和米粉中的碘

采用溶剂提取法对婴幼儿配方乳粉和米粉样品进行前处理,样液通过离子色谱进行分离,由电感耦合等离子体质谱进行碘的定量分析。方法优化了样品前处理条件及仪器条件,可对样品中碘酸根及碘离子进行分离测定,仪器检出限均可达到0.10μg/L,样品测定的精密度为1.16%～3.12%,加标回收率为94.0%～108.0%。采用所建立的方法对国家标准物质奶粉GBW 10017进行了测定,结果令人满意。     

Evaluation of the performance of a constructal mixer with the iodide–iodate reaction system

A novel fluidic mixer, which takes advantage of impingement mixing and is designed according to the constructal approach, is evaluated by the Villermaux/Dushman method. The effects of different configurations (including the structure of the fluid collector and the diameter of the nozzles on the fluid injector) on the mixing performance (i.e. the segregation index and the energy dissipation rate) are determined. The segregation index is smaller, or in other words the degree of mixing is better, when a branch type fluid collector or smaller nozzles are used, however, at the cost of higher energy dissipation rate. When the flow rate is sufficiently high, mixing caused by the impingement of streams is almost complete, rendering the mixing in the branched channels unnecessary. As a result, if very high degree of mixing is pursued, the collector with a simple empty space should be used in the mixer to reduce energy consumption.     

加速剂对镍镀层耐蚀性的影响

研究了NaF和KIO3对Q235钢表面电沉积Ni-P合金层沉积速率的影响,并通过浸泡实验考察了Ni-P合金镀层在质量分数分别为3.5%的NaCl,10%的NaOH和5%的HCl等三种溶液中的耐蚀性.结果表明:NaF并没有提高镀层的沉积速率,而加入KIO3则提高了镀层的沉积速率.同时,加入NaF或KIO3后均能明显改善Ni-P合金镀层的耐蚀性.     

碘酸钾生产技术改进

介绍了碘酸钾生产中,采用硼玻璃回流冷却器回收升华碘,烧结管式过滤器精制碘酸钾,“长路”与“短路”并存氯气处理,中和釜内不进行中和操作等技术改进措施。