中草药中微量锰的测定

以Ｍｎ＾２＋催化ＫＩＯ４氧化结晶紫为指示反应，用催化滴定法测定了菌陈、丹皮等六种中草药中的锰含量，并用原子吸收分光光度法作对照试验，结果满意。实验表明，该法兼具催化动力学分析法的高灵敏度和滴定分析的高准确度的特点，且仪器简单，操作方便。     

半自动催化光度滴定法测定生物样品中的锰

报道了以催化光度返滴定法来测定锰含量的新方法 .以EDTA作络合剂 ,Mn(II)为返滴定剂 ,滴定终点由锰 (II)催化高碘酸钾氧化结晶紫的褪色反应来指示 .在体系中加入表面活性剂 (TritonX - 10 0 )可改善反应条件 ,使测定可在室温下进行 ,用半自动化装置使操作连续、快速、简便 .用该方法测定鸡肝、人发、啤酒中的锰含量 ,结果与原子吸收光谱法所得结果相吻合     

Kinetic spectrophotometric determination of trace manganese (II) with dahlia violet in nonionic microemulsion medium

A new catalytic kinetic spectrophotometric method has been developed for the determination of trace amount of manganese (II) in nonionic microemulsion medium. The method is based on the catalytic effect of manganese (II) on the oxidation of dahlia violet by potassium periodate with nitrilotriacetic acid as an activitor in the presence of nonionic microemulsion. Under the optimum conditions, the calibration graph is linear in the range of 0.0004-0.0056 μg ml⁻¹ of manganese (II) at 580 nm. The detection limit achieved is 3.75×10⁻⁵ μg ml⁻¹. Manganese (II) in foodstuff samples was determined with satisfactory results.     

负催化动力学光度法测定痕量铈

在中性介质中 ,Ce( )对过氧化氢氧化结晶紫的反应有较强的负催化作用 ,据此建立了负催化动力学光度法测定痕量铈的方法。方法线性范围为1 .9× 1 0 - 4～ 2 .0× 1 0 - 3μg/m L ,已用于人发和鸡毛中铈的测定。     

双波长双指示剂催化光度法测定痕量Mn(Ⅱ)

在硫酸介质中,以氨三乙酸为活化剂,利用痕量Mn(Ⅱ)催化高碘酸钾氧化灿烂绿和酸性铬蓝K褪色的指示反应,分别在430nm和630nm波长下测量催化体系和非催化体系的吸光度,建立了双指示剂双波长催化动力学光度法测定痕量Mn(Ⅱ)的新方法。在优化条件下,测定Mn(Ⅱ)的线性范围为0.00200～0.0300μg/mL,检出限为1.2×10-11 g/mL。方法可用于茶叶和废水中痕量锰的测定。     

催化电位滴定法测定铬鞣剂中铬(Ⅲ)

报道了以氨三乙酸存在下锰(Ⅱ)催化KIO4氧化结晶紫的反应指示终点,结晶紫电极作指示电极用催化电位滴定法测定铬鞣剂中Cr(Ⅲ)的方法。该法终点灵敏、准确度高、重现性好,结果满意,用标准加入法测得的平均回收率为100.03%,RSD为0.24%。     

甲基绿选择性电极催化电位法测定茶叶中锰

根据在氨三乙酸存在下,Mn2+催化高碘酸根(IO-4)氧化甲基绿的反应,对用甲基绿选择性电极催化电位法测定痕量锰进行了研究.实验表明,该方法灵敏度高,测定锰的线性范围为3.0～100ng/25mL,选择性好,操作简单,温度控制方便.测定了几种茶叶样品中的锰,与原子吸收法比较,结果满意.     

浊点萃取-分光光度法测定水样中痕量结晶紫

提出了浊点萃取-分光光度法测定水样中结晶紫的新方法,研究了非离子表面活性剂Triton X-114浊点萃取的最佳条件,如pH、试剂用量、平衡时间和温度等。结晶紫的最大吸收波长为579 nm,标准曲线的线性范围是32～700 ng/mL,检出限是9.8 ng/mL,富集倍率为20。结晶紫的浓度在0.2和0.5μg/mL时的相对标准偏差分别为2.5%和1.7%(n=8)。应用本方法测定水样中的痕量结晶紫,平均回收率95.2%～98.1%。     

罗丹明B电极催化电位法测定微量锰的研究

本文基于在邻二氮菲（活化剂）存在下，Ｍｎ（Ⅱ）对高碘酸根氧化罗丹明Ｂ退色反应的催化作用，对于用罗丹明Ｂ电极（自制）以催化电位法测定微量锰进行了研究。实验表明，该方法测锰的线范围为１１－４８ｎｇ／ｍｌ。选择性较好，温度控制方便。本文在未经分离的情况下测定了标准钢样品的锰含量，结果满意。     

痕量锰的催化动力学光度分析法进展

就催化动力学光度法测定痕量锰(Ⅱ)，按不同催化体系，从反应条件、灵敏度、测定范围和应用等方面加以归纳和概括分析．     

Study on catalytic fluorimetric determination of trace manganese

A new kinetic fluorimetric method has been proposed for the determination of trace manganese. The method is based on the catalytic oxidation of rhodamine 6G with potassium periodate in the presence of nitrilo triacetic acid as activator, in near neutral media. The detection limit for manganese is 0.018 ng/ml. The linear range of the determination is 0.04-1.00 ng/ml. The proposed method suffers from few interferences in the presence of more than 30 foreign ions. The method has been used to determine trace manganese in hair, urine, fish and water samples. The results are satisfactory.     

共振瑞利散射法测定硫氰酸盐-碱性三苯甲烷染料体系中的痕量钼

研究了钼(Ⅴ)与硫氰酸盐和结晶紫、乙基紫、孔雀石绿、亮绿及碘绿等5种碱性三苯甲烷染料形成离子缔合配合物的共振瑞利散射光谱。考察了它们的光谱特征、影响因素和适宜的反应条件,确定了共振瑞利散射强度与钼(Ⅴ)浓度之间的关系。方法灵敏度高,不同体系对钼的检出限在2.1～12.0μg/L之间,提出了用共振瑞利散射测定钼的新分析方法,将其用于钢铁中痕量钼的测定获得满意的结果。     

钒(Ⅴ)催化氧化甲基紫的反应动力学及其应用

在 H2 SO4 介质中 ,以抗坏血酸为活化剂 ,痕量的钒 ( )可强烈地催化溴酸钾氧化甲基紫的反应 ,研究了反应的最佳条件及动力学参数 ,探讨了反应机理 ,建立了测定超痕量钒的高灵敏方法 ,方法的线性范围 0 .0～ 2 50 pg/m L ,检出限为 6.5×1 0 - 13g/m L。方法用于井水、蔬菜及血清中痕量钒的测定 ,获得令人满意的结果     

双波长双指示剂-催化动力学光度法测定奶粉中的锌

研究发现在HCl介质中,痕量锌对H2O2氧化甲基紫和亚甲基蓝褪色具有强烈的催化作用,通过测量580 nm和668 nm处催化反应体系和非催化反应体系吸光度的变化,建立了双波长双指示剂催化动力学光度法测定痕量锌的新方法。在最佳实验条件下,线性范围为1.5~60μg/L,线性方程为ΔA=0.0169ρZn2+(μg/mL)+0.0019,r=0.9982,方法检出限为0.84μg/L。该方法可用于奶粉痕量锌的测定。     

Determination of trace manganese in high-purity titanium,silicon and mineral acids by a flow-injection method based on a catalytic reaction

A preliminary microscale ion-exchange separation and a three-line flow-injection manifold are described for the spectrophotometric determination of trace (ng-μg g^?1) manganese in ? 10 mg- samples of high-purity titanium and silicon. The catalytic effect of manganese on the malachite green/periodate reaction is utilized. The method is also conveniently applied to the determination of sub-μg l^?1 levels of manganese in 1–3-ml samples of high-purity hydrofluoric, hydrochloric and nitric acids.     

Kinetic spectrophotometric determination of nanogram levels of manganese by use of the salicylaldehyde guanylhydrazone-hydrogen peroxide system

A kinetic method is described for determining trace amounts of manganese(II), based on its catalytic effect on the oxidation of salicylaldehyde guanylhydrazone by hydrogen peroxide. The reaction is followed spectrophotometrically by measuring the rate of change of absorbance at 505 nm. The calibration graph is linear in the range 8-80 mug/l. with a relative error of +/- 1%. The method has been applied to the determination of manganese in various samples.     

Kinetic fluorimetric determination of nanogram amounts of manganese, based on its catalysis of the oxidation of 2-hydroxybenzaldehyde thiosemicarbazone with hydrogen peroxide

A kinetic method is described for the determination of trace amounts of manganese(II), based on its catalytic effect on the oxidation of 2-hydroxybenzaldehyde thiosemicarbazone by hydrogen peroxide. The reaction is followed by measuring the rate of change of fluorescence (lambda(ex) 365 and lambda(em) 440 nm). The calibration is linear over the manganese range 2-9 ng ml with a precision of +/-1%. The proposed method suffers from few interferences.     

模拟过氧化物酶催化性能的研究

过氧化物酶(POD)能催化H₂O₂氧化一系列氢供体(DH₂)转化成氧化型供体(D)。氢供体可以是邻联二茴香胺、4-氨基安替比林和苯酚及某些染料隐色体等。这类反应不仅可提供检测H₂O₂的灵敏方法,还可与产生H₂O₂的其它酶反应系统联用,测定葡萄糖、半乳糖、氨基酸、尿酸及胆醇等生物物质。     

Kinetic Spectrophotometric Determination of Manganese by Use of the Salicylaldehyde-Hydrogen Peroxide System

Abstract

A kinetic method is described for determining trace amounts of manganese(II), based on its catalytic effect on the oxidation of salicylaldehyde by hydrogen peroxide. The reaction is followed spectrophotometrically by measuring the rate of change of absorbance at 500 nm. The calibration graph is linear in the range 5–100 ng/ml with a relative error of ± 1.2%. The method has been applied to the determination of manganese in natural water.     

KBrO3氧化甲基紫褪色动力学光度法测定食品中痕量钒

基于0.004 mol/L的柠檬酸介质中,痕量V(Ⅴ)催化KBrO3氧化甲基紫的褪色反应,建立了测定痕量V(Ⅴ)的动力学光度法。方法的检出限为1.23μg/L,线性范围为0～0.16μg/mL。讨论了酸度、反应物浓度、温度、反应时间、干扰离子等因素的影响,确定了该体系反应的最佳条件。在25 mL溶液中,测定2.0μg V(Ⅴ)的RSD为1.9%(n=11)。方法可用于测定小麦和苹果中的痕量V(Ⅴ),RSD为1.1%～2.7%,标准加入回收率为97.6%～99.0%。