共查询到19条相似文献,搜索用时 187 毫秒
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阻抑动力学光度法测定白鼠肝脏中的超痕量镍(Ⅱ) 总被引:5,自引:0,他引:5
在 NH3- H2 O- NH4 Cl介质中 ,超痕量镍 ( )能阻抑 H2 O2 氧化甲基紫褪色的指示反应 ,研究了阻抑褪色反应的最佳条件和动力学参数 ,建立了测定超痕量镍 ( )的新方法。方法检出限为 4.4× 1 0 -11g/m L Ni( ) ,测定范围为 0~1 .0μg/2 5m L。方法已用于测定生物样品中的 Ni( )。 相似文献
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催化动力学分光光度法测定痕量锰(Ⅱ) 总被引:3,自引:0,他引:3
严进 《广东微量元素科学》2003,10(9):60-62
研究了氢氧化钠介质中 ,痕量锰催化过氧化氢氧化桑色素褪色反应及其动力学条件 ,建立了催化动力学测定痕量锰的新方法。Mn (Ⅱ )的测定线性范围为 0 0 0 5~ 0 0 60 μg/2 5mL ,检出限为 7 8× 1 0 - 10 g·mL- 1。用于大米中痕量Mn (Ⅱ )的测定 ,结果满意。 相似文献
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阻抑-褪色光度法测定痕量硅 总被引:2,自引:0,他引:2
基于NH3 NH4 Cl缓冲溶液介质中 ,Si 对H2 O2 氧化十六烷基三甲基溴化铵 姜黄素离子缔合物的褪色反应的抑制作用 ,提出了测定痕量硅新的高灵敏的褪色光度法。该方法的表观摩尔吸光系数ε50 0=5 .70× 10 5L·mol-1·cm-1;线性范围为 0 .4~ 3.6 μg/L ;线性回归方程ΔA =2 .2 3× 10 -4 + 0 .0 2 0 17CSi (μg/L) ;相关系数r =0 .9999;测定下限为 2 0× 10 -8g/L。本法用于人发样和水样中痕量硅的测定 ,结果满意。 相似文献
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在pH11.92的Britton-Robinson缓冲溶液存在下,用1,10′-菲口罗啉与Mn2+协同催化H2O2氧化铍试剂Ⅲ的反应,确定了最佳反应条件,测定了反应级数,建立了一个测定超痕量Mn2+的新催化光度法,方法线性范围是0~1.00 ng/mL,检出限为2.4×10-11 g/mL.方法用于一次蒸馏水及烟叶中锰的测定. 相似文献
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高灵敏催化光度法测定痕量锰 总被引:12,自引:1,他引:11
刘长增 《理化检验(化学分册)》2001,37(8):369-371
研究了痕量Mn2 + 催化KIO4 氧化棉红的反应动力学 ,测定了反应级数、表观速率常数和表观活化能 ,确立了速率方程 ,探讨了反应机理 ,建立了测定痕量锰的方法 ,方法灵敏度为 7.5×10 - 9g·L- 1,线性范围为 0 .0~ 6.0× 10 - 6g·L- 1。方法选择性好 ,直接用于化学试剂、井水及蒸馏水中痕量锰的测定 ,结果满意 相似文献
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以3 mL HNO3和2 mL H2O2的混合消解液对烟草样品进行微波消解,采用电感耦合等离子体质谱测定了烤烟中的Mn、Zn、Cu、Se、N i、Co、Cr、As、Cd、Pb 10种微量元素的含量.结果表明:方法的检出限均低于0.02μg/g,各元素测定的RSD(n=5)均小于3%,样品加标回收率为97.35%-101.30%.方法消耗试剂少,快速准确,适合烟草中多种微量元素的同时测定. 相似文献
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鲁米诺-锰(Ⅱ)-高碘酸钾化学发光体系测定痕量锰的研究 总被引:8,自引:0,他引:8
本文提出1种以三乙醇胺作活化剂,基于鲁米诺-锰(Ⅱ)-高碘酸钾化学发光体系高灵敏度、高选择性测定痕量锰的分析方法。检测限达8×10-6μg/mLMn(Ⅱ)。Mn(Ⅱ)浓度在10-5~0.1μg/mL范围内呈良好的线性关系。测定1.0×10-3μg/mLMn(Ⅱ)的相对标准偏差小于±3%。应用于井水及人发样品中锰的测定,结果令人满意。 相似文献
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A novel flow injection chemiluminescence (CL) system for the determination of isoniazid has been proposed. It is based on the direct CL reaction of isoniazid and Mn(III) in sulfuric acid medium. The unstable Mn(III) was on-line electrogenerated by constant current electrolysis. The CL emission intensity was linear with isoniazid concentration in the range 0.1–10 μg/mL; the detection limit was 3.2 × 10−2 μg/mL. The whole process could be completed in 1 min with a relative standard deviation of less than 5%. The proposed method is suitable for automatic and continuous analysis and has been applied successfully to the analysis of isoniazid in pharmaceutical preparation. 相似文献
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增效试剂在动力学分析法中的应用研究Ⅱ: 锰(Ⅱ)-氨三乙酸-十二烷基硫酸钠-高碘酸钾-罗丹明B催化体系 总被引:15,自引:0,他引:15
基于存在活化剂氨三乙酸和增敏剂十二烷基硫酸钠, 锰(Ⅱ)催化高碘酸钾氧化罗丹明B的反应, 拟定了测定痕量锰的新催化光度法。讨论了有关的反应机理。本法由于添加了表面活性剂, 灵敏度提高3.4倍。测定锰含量线性范围为10-120ng·25mL^-^1, 相对标准偏差为2.6%(n=9), 检出限为8.0×10^-^1^1g·mL^-^1。用于测定水样和酒样中锰。 相似文献
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Manganese, nickel, cobalt, and zinc are elements that appear together in many real samples. In this work, a simple, rapid, and sensitive method has been used for the simultaneous separation and preconcentration of trace amounts of these elements using water-soluble polyacrylic acid on alumina as a sorbent in a glass column system. A solution containing Mn, Ni, Co, and Zn was passed through the column at pH 7, and desorption was carried with 5.0 mL of 0.03 M nitric acid. Linearity was maintained between 0.25-5.0 x 10(3), 0.04-6.0 x 10(3), 0.10-8.0 x 10(3), and 0.028-1.0 x 10(3) ng/mL for Ni, Mn, Co, and Zn, respectively, in the original solution. Eight replicate determinations of a mixture containing 1.0 microg/mL of each of the elements in the final solution gave relative standard deviations of 1.4, 1.5, 2.4, and 1.2% for Ni, Mn, Co, and Zn, respectively. The sorption capacities for Mn (mg/g sorbent) obtained were 16.0 for Mn, 9.0 for Ni, 12.0 for Co, and 10.0 for Zn. By using 5.0 mL elution solution, preconcentration factors of 400, 500, 700, and 460 could be obtained for Ni, Mn, Zn, and Co, respectively. 相似文献
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A soluble Mn (IV)-formaldehyde-indomethacin chemiluminescence system was found. Using a synthesized indomethacin MIP as recognition material and soluble Mn (IV)-formaldehyde-indomethacin as detection system, a new molecule imprinted-chemiluminesence method of determination of indomethacin was established. The response range of this method was between 1.0 × 10−7 and 1.0 × 10−5 g/mL with a linear correlation coefficient of 0.994. The detection limit was 4 × 10−8 g/mL. The relative standard deviation for 5.0 × 10−7 g/mL of indomethacin solution was 3.1% (n = 7). 相似文献
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Hui Chen Li Li Min Zhou Yong Jun Ma College of Chemistry Chemical Engineering Gansu Key Laboratory of Polymer Materials Northwest Normal University Lanzhou China 《中国化学快报》2008,19(2):203-206
A high sensitive flow-injection chemiluminescence (FI-CL) method for the determination of tryptophan has been developed. The method is based on the chemiluminescence reaction of galangin-potassium permanganate-tryptophan in polyphosphoric acid (PPA) media. Under the optimized conditions, tryptophan was determined in the range 0.05-10 μg/mL with the detection limit (3tr) of 5.0 × 10^-3 μg/mL. The relative standard deviation (RSD) was 1.0% for 11 replicate determinations of 1.0 μg/mL tryptophan. Three synthetic samples were determined selectively with recoveries in the range from 99.6% to 102.0% in the presence of other amino acids. 相似文献
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A new extraction flotation spectrum method for indirect determination of trace amounts of sulfide by ammonium sulfate‐ethanol‐water system was developed. It showed that Cu(II) could combine with S2? into precipitate (CuS) which was floated in the surface of ethanol and water in the presence of ammonium sulfate. The sulfide can be indirectly determined by determining the flotation yield of Cu(II). The linear range from 2.4 × 10?8to 3.2 × 10?6g/mL and the detect limit of 2.0 × 10?8g/mL was achieved. The results showed the determination of S2? was not affected by Pb(II), Zn(II), Cd(II), Fe(II), Co(II),Ni(II), Mn(II) and Cl?, Br?, I?, etc. In the paper, the method was successfully applied to the determination of a trace amount of sulfide in polluted water samples with the advantages of simplicity of equipment, rapidity, low cost, etc. 相似文献
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Using freshly precipitated manganese-diethyldithiocarbamate (Mn(DDTC)(2)) as a new reagent, a solid phase extraction method (SPE) has been developed for the extraction of Cd(II) and Zn(II) in aqueous fertilizer samples. A sample solution of 300 mL was taken and 0.10 g of freshly precipitated Mn(DDTC)(2) was added. After adding a phosphate buffer solution, the mixture was stirred at 10 min, filtered with a glass filter and washed with deionized water. The solid product containing Mn(DDTC)(2)-Cd(DDTC)(2)-Zn(DDTC)(2) complexes was dissolved in concentrated nitric acid and its volume was made complete up to 10 mL with deionized water. The metal contents of the solution were measured by an atomic-absorption spectrometer. 相似文献