分散液相微萃取-石墨炉原子吸收光度法测定水中铊

Techniques and Methods Detecting Thallium in Water Samples using Dispersive Liquid Phase Microextraction-Graphite Furnace Atomic Absorption Spectroscopy

中文关键词:  表浅胃食管交界腺癌 内镜分型 浸润深度

英文关键词:Ionic associated reaction Solvent demulsification Dispersive liquid phase microextraction Thallium Water sample

中文摘要:

      目的 基于离子缔合反应，建立溶剂去乳化分散液相微萃取联合石墨炉原子吸收光度法测定水中铊的方法。方法 采用溴水为氧化剂，样品中的铊被氧化为铊（Ⅲ），与Cl^-反应生成配阴离子TlCl₄^-，加入三辛胺作为萃取剂， TlCl₄^-与三辛胺形成离子缔合物的同时被萃取，在乙醇分散剂的作用下，实现铊的分散液相微萃取，萃取完成后，加入去乳化剂进行相分离，取有机萃取相进行石墨炉原子吸收测定。采用胶体钯作为基体改进剂，两步干燥和两步灰化的升温程序，提高石墨炉原子吸收测定的精密度和灵敏度。结果 本研究所建立的方法在铊0.05~2.0 μg/L浓度范围内线性良好，方法检出限为0.011 μg/L，精密度为9.9%，加标回收率在94.0%~103.0%之间。结论 本研究建立的方法简单灵敏，适合水样中铊的批量分析。

英文摘要:

      Objective To reveal if whether fennel fruit (Fructus Foeniculi) tea drinking enhances the recovery of intestinal function after gynecologic malignancies operation. Methods A total of 159 patients undergoing laparotomy for gynecological cancers were randomized into a tea group (n=78) and a control group (n=81). The patients in tea group drank a cup of fennel fruit tea while patients in control group drank the equal quantity of water twice per day from the first morning after operation until the first flatus. Every cup of tea consists of 5 gram of dried fennel fruit and 130 mL boiled water. The patents only drank the filtrate. Groups were compared in terms of time to first flatus and defecation, postoperative hospital stay, length of parenteral nutrition, ileus symptoms and other postoperative complications. Results Postoperative hospital 〔(5.6±1.2) d vs. (6.7±2.0) d, P<0.001〕, the mean time to flatus 〔 (53.1±11.3) h vs. (64.2±13.6) h， P<0.001) 〕, and the mean time to defecation 〔(4.3±1.0 ) d vs. (5.4±1.2) d, P<0.001) 〕 were significantly lower in tea group compared with those in control group. Ileus symptoms were observed more in patients in the control group compared to patients in tea group 〔relative risk=2.6; 95%confidence interval,1.5-4.5; P=0.001 〕. Conclusion Fennel tea drinking after laparotomy for gynecological malignancis, an economical care, is safe, well to lerated and associated with rapider recovery of bowel motility, shorter hospital stay and fewer complications.