酱油,醋中微量砷的催化示波极谱测定

The determination of trace arsenic in soy and vinegar by oscillopolarography was investigated. A sensitive catalytic wave of arsenic appeared at -0.73V (vs. SCE) in 2mol/L H2SO4-0.2 mol/L KI-5 micrograms/ml Te systems. The linear relationship was 0-100ppb. The determination of arsenic in soy and vinegar was carried out after digestion with nitricperchloric acids. The detection limit was 1 ppb. The relative standard deviations were 4.7% and 8.8% respectively from the determinations of soy and vinegar. Recoveries were 92%-102% and 96%-110% respectively.     

催化极谱法测定测定海产品中微量砷

海产品中微量砷的测定方法有银盐法、砷斑法，有资料报道催化极谱法测定水、食盐、汽水、尿中微量砷。催化极谱法测定海产品中微量砷的方法未见报道。根据极谱催化波理论和实验室现有条件，笔者在前人研究工作的基础上，经过大量实验工作，成功的应用催化极谱法进行海产品中微量砷的测定。完成了1994年四川省卫生检验质控考核工作，进行考核样海产品中微量砷的测定。     

示波极谱法测定罐头食品中的锡

目的：建立测定罐头食品中锡的示波极谱测定法。方法：利用锡在硫酸(H2SO4)-碘化钾(KI)-抗坏血酸(Vit C)-偏钒酸铵(NH4VO3)体系中有一灵敏的极谱波，对几种罐头食品中的锡进行测定。结果：锡浓度在O～2．Oμg／ml时线性良好，方法：检出限为O．12μg／L，相对标准偏差(RSD)在4．22％～8．33％之间；样品平均回收率为94．7％～112．O％。将本法与食品国家卫生标准方法比较，结果令人满意。结论：本法简便、快速、灵敏，测定干扰少，可用于实际样品的测定。     

示波极谱法测定酒中微量铅

用示波极谱法在ＰＨ５．３的六次甲基四胺－盐酸－邻菲啉体系中测定酒中微量铅。方法简便、快速、选择性好，灵敏度较高，检出限为０．００５μｇ·ｍｌ－１，线性范围为０．０２～１．３μｇ·ｍｌ－１，结果准确可靠，变异系数为２．６－６．８％，样品加标回收率为８８～１０９％。     

示波极谱法测定空气中的痕量镓

Gallium and its compounds in air collected by millipore filter membrane are leached by 10% HNO3 at room temperature. After being adjusted with ammonia solution to pH8-9, the leachate is filtered and the filtrate is evaporated to dryness on a water bath. The residue is dissolved with 2 ml of 10% HNO3 and then into the solution are added 0.5 ml of 5% hydroxylamine hydrochloride solution, 0.20 ml of 5% sulfosalicyclic acid solution, 0.5 ml of NaF solution (1mg F/ml) and 1 drop of methyl red solution. Let it stand for 5 min after the color of the solution turns orange by addition of 1:1 NH4OH solution. Add 0.20ml of 0.20% cupferron solution, 0.20ml of 0.5% diphenyl-guanidine solution (prepared in 95% ethanol) and 0.5ml of acetic acid-ammonium acetate buffer (pH 7.0). Then add water to make the final volume of the test solution to be 10ml and measure the height of the second derivative polarographic wave at -1.08V (vs.SCE). The sensitivity of the method is 0.005-0.10 microgram/ml, the coefficient of variation 6.8%, recovery 97.8%. Within 0.005-0.10 microgram/ml, the wave height is linear with the concentration of gallium.     

催化示波极谱法测定水中硒的研究

硒是生物体所必需的微量元素之一,具有多种生物功能,随着人们生活水平的提高,对膳食结构与人体健康的重视,越来越有必要对硒的含量进行测定。《生活饮用水卫生规范》规定饮用水卫生标准中Se含量为<0.01mg/L。在自然界中硒主要以化合物形式存在。水中硒主要以无机的Se6 、Se4 、     

示波极谱法测定血中铅的方法研究

作者报道了在盐酸－碘化钾－钒（ＩＶ）－乙醇－不血酸体系中，用络合催化极谱法测定血中向量铅的方法。在此体系中，铅的峰电位为０．５４Ｖ（ＶＳ．ＳＣＥ），铅浓度在０－１．００μｇ／３ｍｌ范围内与峰电流有良好的线性关系。榈中加标回收率为７６．０－１０５．０％，顺收率为９１．０１％相对标准偏差为３．６－７．０％。最低检测浓度为４５μｇ／Ｌ。采用本法对２４例正常人和６例铅作业工人血中铅的测定，结果与临床诊断２     

氢化物原子荧光光谱法同时测定饮用水中的砷和汞

目的用氢化物发生原子荧光光谱法分析水中的砷和汞。方法详细研究了灯电流、载气流速、原子化器高度、盐酸浓度和硼氢化钾浓度等因素对检测的影响。结果在仪器最佳工作条件下,砷和汞分别在0～10.00μg/L和0～2.00μg/L的浓度范围时呈现良好的线性关系,相关系数为0.9994和0.9986;砷和汞的检出限分别为砷0.028μg/L汞0.0044μg/L;相对标准偏差分别小于0.8%和0.6%;砷和汞的加标回收率分别在98%～104%和99%～110%之间。结论本方法具有操作简单、快速、基体干扰少、灵敏度高和重现性好的优点,能用于同时测定水中的砷和汞。     

流动注射氢化物原子吸收法测定螺旋藻片中砷的含量

螺旋藻片是由颤藻科原生生物钝顶螺旋藻Spirulinaplaensis的干燥藻体制成的制剂。螺旋藻含有丰富的营养成分,具有益气养血,健脾化痰,调节机体免疫功能。用于病后体虚,血小板低下,高血脂症,以及肿瘤化疗后引致免疫功能低下的辅助治疗。为了更好地控制产品的质量,我们参考文献[1,2],对其有害元素砷的含量测定方法进行了研究。1实验部分1．1仪器与条件岛津AA－670G原子吸收分光光度计,岛津砷空心阴极灯;WHG－102A型流动注射氢化物发生器以及电加热T型石英管（145mm×8mm）（北京瀚时制作所研制）;0～250V可变交流变压器。检测…     

Blood Pressure Associated with Arsenic Methylation and Arsenic Metabolism Caused by Chronic Exposure to Arsenic in Tube Well Water

Objective The effects of arsenic exposure from drinking water, arsenic metabolism, and arsenic methylation on blood pressure (BP) were observed in this study.Methods The BP and arsenic species of 560 participants were determined. Logistic regression analysis was applied to estimate the odds ratios of BP associated with arsenic metabolites and arsenic methylation capability.Results BP was positively associated with cumulative arsenic exposure (CAE). Subjects with abnormal diastolic blood pressure (DBP), systolic blood pressure (SBP), and pulse pressure (PP) usually had higher urinary iAs (inorganic arsenic), MMA (monomethylated arsenic), DMA (dimethylated arsenic), and TAs (total arsenic) than subjects with normal DBP, SBP, and PP. The iAs%, MMA%, and DMA% differed slightly between subjects with abnormal BP and those with normal BP. The PMI and SMI were slightly higher in subjects with abnormal PP than in those with normal PP.Conclusion Our findings suggest that higher CAE may elevate BP. Males may have a higher risk of abnormal DBP, whereas females have a higher risk of abnormal SBP and PP. Higher urinary iAs may increase the risk of abnormal BP. Lower PMI may elevate the BP. However, higher SMI may increase the DBP and SBP, and lower SMI may elevate the PP.     

石墨炉原子吸收法测定水样中的砷

目的建立检测水中砷含量的石墨炉原子吸收法分析方法。方法采用硝酸镍为基体改进剂,用石墨炉直接进样测定水中砷含量进行测定。结果方法的线性范围在0μg/L~30μg/L,回归方程为y=0.0102+0.007,相关系数r=0.9989,回收率87%~105%,相对标准偏差小于4%,最小检出浓度为0.4μg/L.结论本方法简单经济,快速和准确,值得推广使用。     

流动注射-氢化物发生-原子吸收法测定中药提取物中微量砷

目的：探讨流动注射-氢化物发生-原子吸收光谱法(FI-HG—AAS)测定微量砷时的最佳条件,建立中药提取物中微量砷的FI-HG-AAS分析方法。方法：流动注射-氢化物发生．原子吸收光谱法。结果：在优化的工作条件下测定砷的检出限为0．56μg/L,线性范围0．6～30μg/L,相对标准偏差小于5%,加标回收率为91％～104％。应用于实际样品中微量砷的测定,获得满意结果。结论：本法克服了传统间断氢化物发生-原子吸收光谱法分析速度慢、样品耗量大、操作繁锁等缺点,方法操作简便、快速,灵敏度及自动化程度高。     

ICP—AES法测定茶叶中铅,砷,铜

建立端视ＩＣＰ－ＡＥＳ测定茶叶中铅，砷，铜的方法，方法电感耦合等离子发射光谱法。结果：向项分析性能指标如检出限，准确度，精密度均达到痕量元素分析的要求，结论：本法快速，灵敏适用于茶叶国家卫生标准中铅，砷，铜的测定。     

塞曼石墨炉原子吸收光谱法测定中成药心灵丸中砷的含量

以高压湿法消化样品,以ＰｄＣｌ２－Ｍｇ（ＮＯ３）２为混合基体改进剂,普通石墨管,塞曼效应扣除背景吸收研究了含有复杂的动植物样品的前处理和砷的灰化温度、原子化行为及干扰的消除。结果表明,高压湿法消化对样品消化完全,且砷无损失。方法简便、准确,灵敏度及精度高。标准加入法所得相关系数ｒ大于０．９９９,样品测定相对标准差为０．３％￣２．８％。回收率为９７．８％￣１０６．５％。     

示波极谱法测定蔬菜中亚硝酸盐

目的：研究测定蔬菜中亚硝酸盐的新方法。方法：采用示波极谱法测定亚硝酸盐。结果：本法的检出限为0，012／μg／ml，线性范围为0．05pg／ml～1．50／μg／ml，变异系数为2.1％～4．0％，洋品加标回收率为95．0％～107．0％，本法与标准方法测定结果比较．差异没有显著性。结论：本法测定蔬菜中亚硝酸盐．灵敏度高．操作简便，分析快速．试剂无毒且用量少，精密度和准确度均较高。     

微波消解-原子荧光光谱法测定洋甘菊中砷的含量

目的 建立洋甘菊中砷含量的原子荧光光谱检测方法 。方法 采用微波消解样品,通过原子荧光光谱法测定洋甘菊中砷含量,并进行了方法 学考察。结果 砷在0～10．0μg／L（r=0．9993）范围内峰面积与浓度呈良好线性关系,平均加样回收率为100．81％,RSD=2．59％（n=6）。结论 该测量方法 简便、稳定、危害小、灵敏度高。     

催化动力学法测定人体血清中痕量铜的研究

研究Ｃｕ~（２＋）在稀氨水介质中催化Ｈ_２Ｏ_２氧化苯基荧光酮褪色反应及影响反应速率的动力学因素。据此建立催化动力学法测定痕量Ｃｕ~（２＋）的新方法，其灵敏度为５．０×１０~（－１１）ｍｏｌ／Ｌ，测定范围为（０～２．５）×１０~（－７）ｍｏｌ／Ｌ。操作简便、快速。该法可用于人体血请中痕量铜的测定。