土壤样品中铜锌的测定

结合实际,谈谈土壤样品中铜锌的测定。     

一类新的化学发光反应的研究

报道了酸性过氧化氢在一些金属离子存在时与碱溶液发生的化学发光反应.对影响化学发光的因素以及金属离子的作用进行了试验和讨论.     

泡塑快速富集法测定化探样品中微量金

本文采用泡沫塑料吸附富集化探样品中微量金,用发射光谱法测定微量金的含量,对样品的焙烧、王水封闭溶矿、泡塑吸附富集等过程的条件控制及优化进行了阐述,该方法具有检出限低、灵敏度高、操作简便、速度快、成本低、劳动强度小等特点。     

铜：古老金属的新发现

铜是人类最早发现也是最先应用的古老金属之一,早在公元前6000年人类就开始使用铜。铜因其具有许多优异的特性和奇妙的功能,为人类社会的进步作出了不可磨灭的贡献;而且随着人类文明的发展不断开发出新的用途。铜既是一个古老的金属,又是一个充满生机和活力的现代工程材料。     

《工业硫酸锌中铜含量的测定》方法的研讨

化学分析高级工国家题库,工业硫酸锌中铜含量的测定,引用标准HG/T 2326-92,在PH=5.7～9.2的溶液中,铜离子与铜试剂生成黄色的胶体悬浮物,用乙酸乙酯有机试剂萃取后进行比色测定。用3cm比色皿,用蒸馏水作参比,导致测量结果出现偏移,影响实验结果。     

铁氰化钾—过氧化氢氧化鲁米诺发光的研究及应用

研究了铁氰化钾-过氧化氢氧化鲁米诺化学发光行为,依据铜对该化学发光反应的抑制作用,建立了微量钢的化学发光测定法,该法要出限为2.5×10~(-10)g/ml,线性范围为1.0×10~(-9)～1.0×10~(-5)mg/L.此方法已成功地用于实际水样中微量铜的测定.     

火焰原子吸收法测定矿石中铜的几种溶样方法比较

系统比较了矿石中铜的几种溶样方法以及在不同介质条件下对测定结果的影响,得出了火焰原子吸收法测定铜含量的过程中的几个重要结论,对实际工作有着非常重要的指导意义。     

超微弱化学发光体系的研究及应用

随着科技的发展,在近几年,人们对过氧化氢以及无机盐在结合中所产生的超微弱化学发光体系的研究越来越多。本文阐述了超微弱化学发光体系的研究现状,从而得知该体系的反应条件比其它化学物品要温和,并且具有高选择性,可以为开发新型化学发光试剂提供相应的理论基础。     

从低品位铜钼矿体中回收铜钼的浮选试验研究

对某低品位铜钼矿回收铜钼进行了选矿试验研究,由于该矿中铜矿物氧化严重,采用铜钼混合浮选流程,粗选获得的铜回收率较低。为提高粗精矿中铜钼的回收率,采用高效选择性捕收剂DF与丁基黄药组合使用,所得粗精矿铜、钼品位分别达到4．03％和0．176％,回收率分别达到52．44％和84．33％,获得了较好的选别指标。     

表面活性剂在化学发光反应中的作用

数种表面活性剂对鲁米诺-H_2O_2-Fe~(3+),光泽精H:O。AllO和2,9一二甲基一1,IG菲咯琳一H:O。-Cu’”三种化学发光反应的影响情况进行了试验研究,对表面活性剂在化学发光反应中的作用及机理进行了初步讨论.     

废水中痕量银和汞同时测定的停流式FIA－速差动力学法

依据微酸性条件下Ａｇ（Ⅰ）和Ｈｇ（Ⅱ）在ＫＳＣＮ－罗丹明Ｂ－阿拉伯树胶体系中形成多元缔合物的速度差异，用停流法研究了各种因素分别对Ａｇ（Ⅰ）、Ｈｇ（Ⅱ）多元缔合物体系反应速度的影响。提出了同时测定环境样品中痕量银和汞的流动注射－速差动力学光度法。本法测定Ｈｇ（Ⅰ）和Ａｇ（Ⅱ）的线性范围分别为０．２～３．５μｇ／ｍｌ和０．１５～２．６０μｇ／ｍｌ。检测限为０．０１μｇ／ｍｌＡｇ（Ⅰ）和０．００８μｇ／ｍｌＨｇ（Ⅱ）．常见共存离子基本不干扰测定。用本法测定了废水及混合标准溶液中银和汞含量，结果满意。     

褪色光度法测定水中痕量铜

在表面活性剂存在下及硫酸介质中,70℃恒温水浴中,铜（Ⅱ）催化溴酸钾氧化亚甲基蓝褪色。据此建立了测定痕量铜的方法。铜（Ⅱ）浓度的线性范围为0-0．1mg．L^-1,最大吸收波长为660nm,摩尔吸光系数为2．2×10^4L．g^-1．cm^-1,检出限为3．82×10^-6g·L^-1。方法简单快速、选择性好,用于测定水中铜含量时,测定结果与AAS法的结果相近,所得结果的RSD值均小于3．2％,回收率在99—104％。     

Study of the Concentration of Trace Elements Fe,Zn, Cu,Se and Their Correlation in Maternal Serum,Cord Serum and Colostrums

A study of iron, zinc, copper and selenium concentration levels was carried out in three compartments namely, maternal serum (MS), colostrums and cord blood serum (CS) of healthy Indian mothers (n = 42) who delivered healthy normal neonates without any congenital anomalies at Bhabha Atomic Research Centre hospital, Mumbai. Fe, Zn, Cu in maternal serum, cord blood and colostrums were estimated by flame atomic absorption spectrometry while Se was determined by graphite furnace absorption spectrometry. It was seen that there was a significant difference in the level of trace elements in the three compartments. The average levels of Fe in the three compartments were 1,132 ± 519, 2,312 ± 789 and 1,183 ± 602 μg/L while Zn was 514 ± 149, 819 ± 224 and 7,148 ± 2,316 μg/L respectively. Mean Cu values were 1,614 ± 295, 301 ± 77 and 392 ± 174 μg/L respectively while Se values were 70 ± 15, 36 ± 10 and 23 ± 8 μg/L respectively. The results indicated a positive correlation of Fe and Zn concentrations in MS versus CS which were (r = 0.386), (r = 0.572) respectively and Fe levels in MS and colostrums (r = 0.235). A few inter element correlations were found within compartments. Zn and Se showed a negative correlation in both MS (r = −0.489) and colostrums (r = −0.258) while a positive inter correlation of Fe and Zn was seen in MS (r = 0.44) and in CS (r = 0.54). This study gave us an overview of the serum and colostrum values of mother and neonates in Indian population, data of which are scarce.     

植物组织中糖化合物测定方法的研究进展

糖是植物生命现象中重要的生物高分子化合物。本文研究了近十年植物组织中糖类化合物的测定方法,为植物组织中的糖化合物的测定提供理论依据。     

Stability of Lyophilized Human Serum for Use as Quality Control Material in Bhutan

Quality control (QC) materials are crucial for internal quality control (IQC) and external quality assessment scheme (EQAS). However, many developing countries are disadvantaged by unavailability and high cost of commercial control material. Therefore, preparing home-made lyophilized human serum will be cost effective for used as a QC material in Bhutan. We prepared lyophilized QC material using serum collected from Bhutanese volunteers. The stability of lyophilized serum was studied at 3 selected conditions by analyzing at certain intervals. The results were statistically compared with initial values. The significant p values (<0.05) were seen in glucose, BUN, ALT, total bilirubin and protein at 2–8 °C but no significant difference were observed at −20 °C at the end of 9 months. We concluded that, home-made lyophilized human serum prepared without stabilizers could be used at least up to 9 months if stored at −20 °C and 7 months at 2–8 °C. Stabilizers and additives are necessary if the materials are to be used longer than 7–9 months.     

Importance of Serum Copper and Vascular Endothelial Growth Factor (VEGF-A) Levels in Postmenopausal Bleeding

The main aim of this study is association of serum copper and vascular endothelial growth factor (VEGF-A) in postmenopausal bleeding (PMB) patients. Blood samples were collected from female patients suffering with postmenopausal bleeding (n = 50) as well as healthy females as controls (n = 50). Serum copper levels were estimated by spectrophotometric method and serum VEGF-A by ELISA technique and compared with ultrasonographic measurement of endometrial thickness in both patients and controls. A significant increase in serum copper levels and an almost twofold increase in serum VEGF-A was observed in DUB patients when compared with controls. Correlation (r) between serum VEGF-A levels and endometrial thickness was 0.96. Odds ratio for copper, VEGF-A and combination of copper and VEGF-A was 0.0426, 0.0947 and 0.0313 respectively, in all these cases odds ratio was <1. The abnormal angiogenesis in PMB could be due to increased serum copper levels,which in turn stimulates factors like VEGF-A, thereby causing an increase in endometrial growth.     

分光光度法测定丙烯中的痕量硫

建立了分光光度法测定丙烯中痕量硫的方法,当样品中硫质量分数在0—1mg/kg内,样品中硫含量与吸光度呈良好的线性关系,检出限为0.1mg/kg。该方法适用于丙烯中痕量硫的测定。