Determination of High Iodine Levels by ICP-OES after Separation from Excess Phosphate by Co-precipitation

For determination of iodine,dissolution or oxidation of an organic matrix by acid K-chlorate in dilute nitric acid to obtain non-volatile iodate immediately,is a method of choice.Optical emission spectroscopy is usually sensitive enough to control iodized table salt.Spectral interference by P upon the most sensitive I-emission line,e.g.in mineral feeds and marine algae,was overcome by co-precipitation of P with Al-or Fe hydroxide,leaving iodate(and also borate)in solution.After addition of Al or Fe nitrate or sulfate,ammonia was added to reach pH 8.8,and the resulting precipitate separated by cetrifugation and decantation.Al-hydroxide was more efficient,and its precipitation was facilitated by adding 10-30 mg of a natural clay to 5 mL sample.Correct results with materials from former ring tests were obtained down to 15 mg/kg by an ICP 20 years of age.Highlights:This method enables to use optical emission ICP for determination of high levels of iodine after a simple separation of phosphate from oxidizing acid digests,thus avoiding catalytic or spectrophotometric methods,or high blanks in an ICP-MS utilized for ambient iodine levels.

2005—2006年奥地利难民中一次耐多药结核病的爆发

背景:2005—2006年奥地利结核病参比室验室确诊了4例菌株基因型相同的耐多药结核病患者。目的:明确耐多药结核菌传播途径。方法:通过查阅结核报告记录和医院出院单进行流行病学病例研究。结果:2004年6月,这个耐多药菌群中的原发病例(38岁),在因非法移民被扣留7个月后,最初被诊断为非耐多药结核病。到2005年3月,他有4个月失访。2005年6月他被诊断为肺和喉部的耐多药结核。出院后,这个病例又出现了失访,直到2006年4月,他因复发耐多药结核再次入院。2006年4月3例和原发病例有相同菌型的耐多药肺结核病例被确诊:原发病例5岁的女儿和25岁的朋友及朋友6个月的儿子。结论:由于奥地利耐多药结核病(MDR-TB)源于HIV阴性群体,显然有必要实施国家指南进行MDR-TB的管理。