一阶导数分光光度法同时测定记忆合金电镀液和电镀层中铁和钯

在酸性介质中,铁和钯分别与亚硝基Ｒ盐络合形成绿色的Ｆｅ－ＮＲＳ和红色的Ｐｄ０ＮＲＳ,利用一阶导数分光光度法在水相中同时测定Ｆｅ和Ｐｄ。结果证明,两种络合物的摩尔吸光系数分别为１．９４×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾０１（对铁）和１．６３×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾１（对钯）;线性范围分别为０－５．６ｍｇ／ｌ（对铁）和０－７．０ｍｇ／Ｌ（对钯）;相对标准偏差均小于２．０％;回收率为９６５－１     

分光光度法连续测定铜、钴、钯

1 引言对复杂的分析体系,不经分离而直接迸行多组分的连续测定一直是分析化学中的一个重要研究课题.本文基于铜、钴和钯与5-(5-硝基-2-吡啶偶氮)-2,4二氨基甲苯(5-NO_2PADAT)显色酸度和络合物稳定性的差异,成功地实现了铜、钴和钯的连续测定.经对实际样品的分析,获得满意结果.2 实验部分2.1 仪器和试剂 岛津UV-260分光光度计;铜、钴、钯标准溶液浓度分别为10mg/L、4mg/L和10mg/L;5-NO_2-PADT乙醇溶液:1.0x10_(-3)mol/L;pH=5.2的HAc-NaAc缓冲溶液.所用试剂均为分析纯.2.2 实验方法 (1)铜的测定 于两只10mL比色管中分别加入同样比例的铜、钴、钯标准溶液,2mL缓冲溶液,1.0mL5-NO_2-PADAT溶液,摇匀,再加入1mLO.5%盐酸羟胺溶液、3mL95%乙醇溶液,于其中一只中再加入1mL0.01mol/LEDATA溶液.以水稀释至刻度,摇匀,放置10min分别用1cm比色皿于519nm处以试剂空白作参比测其吸光度A_1和A_2,A_1与A_2之差为铜的吸光度.(2)钴、钯的测定 于两只10mL比色管中分     

分光光度法测定痕量钯

在 pH为 7.5 0的条件下 ,Pd2 +与甲基紫、溴化钾反应形成紫色缔合物 ,吸收峰位于 5 80nm ,Pd2 +浓度在 10 0～ 80 0 μg/L范围内与吸光度成正比 ,表观摩尔吸光系数ε580 =2 .4× 10 5L/ (mol·cm) .方法操作简便 ,灵敏度高 ,用于试样中痕量Pd2 +的测定 ,结果令人满意 .     

K系数分光光度法同时测定钴矿中铜、钴、镍

探讨了在pH 8.00时,溴化十六烷基三甲基铵在存下,铜(Ⅱ)、钴(Ⅱ)和镍(Ⅱ)与二甲酚橙显色的反应条件.建立了K系数分光光度法同时测定钴矿中铜、钴、镍的分析方法.铜、钴、镍含量分别在0～800 μg·L-1,0～1.60 mg·L-1,0～1.20 mg·L-1范围内符合比耳定律.方法用于钴矿试样的分析,测得铜、钴、镍的相对标准偏差分别为3.5%,4.9%,3.4%,回收率分别为103.3%,92.6%,99.0%.     

Madaline网络用于分光光度法同时测定铜钴镍的研究

采用4－（2－吡啶偶氮）－间苯二酚（PAR）－Cu,Co,Ni显色体系，应用Madline神经网络原理，对于吸收光谱严重重叠的三组分金属配合物体系同时进行含量测定，Cu^2 ,Co^2 ,Ni^2 的平均回收率分别为94％，101％，102％，实验表明，该法具有训练速度快，预测结果准确度良好等特点，有望成为多组分分析的有效方法之一。     

分光光度法同时测定微量铁和钴

在碱性介质中,铁(Ⅱ)和钴(Ⅱ)可与硫代巴比妥酸-NO2-体系反应分别形成一种稳定的兰色和黄色配合物,铁(Ⅱ)配合物在656nm和386nm具有吸收峰,钴(Ⅱ)配合物只有一个吸收峰位于423nm,体系的吸光度A6Fe56、A4F2e3、AC42o3与铁、钴含量在一定的范围内呈良好的线性关系,且铁(Ⅱ)、钴(Ⅱ)配合物在423nm波长处的吸光度具有良好的加和性,建立了一种同时测定微量铁和钴的新的分光光度法。方法的线性范围分别为铁0～50μg/(25mL)、钴0～25μg/(25mL)。将该法应用于水样中微量铁和钴的同时测定,其结果分别与原子吸收光谱法和紫尿酸光度法相吻合,加标回收率分别为98%～102%和94%～106%,相对标准偏差(RSD)分别为1.0%～1.8%和3.1%～4.7%(n=5)。     

H-Point Standard Addition Method for Simultaneous Determination of Palladium and Cobalt

The H-point standard addition method (HPSAM) has been applied to simultaneous determination of palladium and cobalt at trace levels, using 1-(2-pyridylazo)-2-naphthol (PAN) as a chromogenic reagent. Palladium and cobalt at neutral pH levels form green colored neutral complexes with PAN which are soluble in aqueous sodium dodecylsulfate (SDS) micellar media and can be monitored spectrophotometrically. Simultaneous determination of cobalt and palladium by HPSAM were performed spectrophotometrically and under optimum conditions. Absorbances at the two pairs of wavelengths, 597 and 650 nm or 566 and 612nm, were monitored while adding standard solutions of cobalt or palladium, respectively. The method is able to accurately determine a cobalt/palladium ratio of between 5:1 and 1:30 (wt/wt). The accuracy and reproducibility of the determination method for various known amounts of cobalt and palladium in their binary mixtures were evaluated. The effects of diverse ions on the determination of cobalt and palladium to investigate the selectivity of the method were also studied. The recommended procedure was applied to real water samples and synthetic sample solutions.     

双波长K系数-标准加入-导数分光光度法同时测定重油中的钴镍

本文提出了一种同时测定两组分混和物的新方法，即双波长Ｋ系数－标准加入－导数分光光度法，该法同时进行两组分的标准加入，以两个组分的峰值波长为测定波长，又互为参比波长，利用Ｋ系数法以一套吸光度数据同时完成两个组分的测定。本文以ＯＰ－５－Ｂｒ－ＰＡＤＡＰ为显色体系，同时测定了重油中的钴、镍，结果令人满意。本方法简便，灵敏度高。     

Simultaneous Laser Thermal Lens Spectrometric Determination of Trace Platinum and Palladium in an Aqueous Solution

ＩｎｔｒｏｄｕｃｔｉｏｎＩｔｉｓａｎｉｍｐｏｒｔａｎｔｒｅｓｅａｒｃｈｔｏｐｉｃｔｏｄｅｔｅｒｍｉｎｅｄｉｒｅｃｔｌｙｔｈｅｃｏｍｐｏｎｅｎｔｓｏｆａｃｏｍｐｌｅｘｓｙｓｔｅｍｗｉｔｈｏｕｔａｐｒｉｏｒｓｅｐａ ｒａｔｉｏｎ .Ｂｙｕｔｉｌｉｚｉｎｇｔｈｅｄｉｆｆｅｒｅｎｃｅｓｏｆｒｅａｃｔｉｏｎｃｏｎｄｉｔｉｏｎｏｆｔｈｅｍｅｔａｌｉｏｎｓｗｉｔｈｃｈｒｏｍｏｇｅｎｉｃｒｅａｇｅｎｔ (ｔｅｍｐｅｒａｔｕｒｅｏｒａｃｉｄｉｔｙ)ｏｒｔｈｅｄｉｆｆｅｒｅｎｔｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｔｈｅｃｏ…     

Simultaneous Laser Thermal Lens Spectrometric Determination of Trace Platinum and Palladium in an Aquesous Solution

A selective and sensitive method for determination of platinum and palladium(Ⅱ）in an aqueous solution simultaneously by laser thermal lens spectrometry,based on the complex reaction of 2-(3,5-dichloropyridylazo)-5-dimethylaminoamiline(3,5-diCl-PADMA) with platinum and palladium,has been developed.It is shown that the palladium complex can be fromed at room temperature, while the platinum complex can be only formed after being heated in a boiling water bath.By using this difference of reaction temperature and the characteristic of the complexes mentioned above,the method for simultaneous determination of platinum and palladium was established in an aqueous solution without a pre-separation.The results show that the dynamic linear ranges of determination for platinum and palladium are 0.005-0.04μg/mL and 0.005-0.25μg/mL respectively,and that the detection limits are both 0.002/μg/mL.The method has been applied to the determination of platinum and palladium simultaneously in alloy and catalyst samples with satisfactory results.     

Simultaneous Determination of Perphenazine and Amitriptyline by Derivative Spectrophotometry

Abstract

Two methods have been developed for the simultaneous determination of Amitryptiline and Perphenazine: the zero-crossing (I) and the derivative ratio spectrum (II) methods and both use the derivative spectrophotometry.

The methods have been applicable in the ranges of 1 to 30 μg·ml^?1 of Amitryptiline (I and II) and between 1 and 8 μg·ml^?1 and from 1 to 7 μg·ml^?1 of Perphenazine for the methods I and II respectively. The accuracy of the proposed methods have been studied and they have been used in the determination of Amitryptiline and Perphenazine in commercially available pharmaceuticals.     

遗传算法用于地质样品中钴、镍五种相态的同时测定

根据地质样品中钴、镍硫酸盐、镍黄铁矿、橄榄石、磁铁矿、菱铁矿5种相态不同的化学性质,选择了浸取剂,确定了最佳浸取条件,获取了各相态稳定的浸取率常数,并将遗传算法与钴、镍的化学物相分析相结合,建立了地质样品中钴、镍的五种相态同时测定的方法。方法简便、快速。其钴、镍的RSD(%)分别为:硫酸盐1.2、0.5,镍黄铁矿3.0、0.7,橄榄石1.0、0.25,磁铁矿2.9、2.4,菱铁矿5.5、2.4。平均相对误差小于5%。     

三阶导数分光光度法同时测定铜,钴与镉

采用三阶导数光谱技术，以ｍｅｓｏ－四（４－三甲铵基苯基）卟啉作显色剂分光光度法同时测定了微量的铜、钴与镉。方法中以铅离子掩蔽过剩试剂的吸收峰，然后进行三级微分求导，可以使铜、钴、镉吸收峰完全分开，于４１５ｎｍ、４３４ｎｍ及４３８ｎｍ处同时测定３元素含量，由三阶导数光谱的吸光值可求算出配合物的三阶导数摩尔吸光系数分别为：１．１１×１０６、３．９５×１０５及６．４７×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。     

双波长分光光度法同时测定岩石矿物中的微量金和钯

本文提出以硫代米蚩酮为显色剂，用双波长分光光度法同时测定岩石矿物中的微量金和钯的方法，消除了测定金钯的相互干扰，该方法简便，快速，选择性好，用于矿石样品中金和钯的测定，结果满意。     

比浊法测定酸性镀铜液中微量氯离子

以乙二醇为增溶剂,硝酸银作沉淀剂,采用氯化银比浊法,在不分离硫酸铜的条件下,直接测定酸性镀铜液中微量氯离子。测定波长为440 nm,线形范围为0~50μg/25 mL,其表观摩尔吸光系数ε=1.3×105,方法检出限为0.035μg/mL,该法用于测定酸性镀铜液中微量氯离子在不同水平的加标回收率为95.4%~104.5%。结果表明,该法准确,快速,简便,其它的常见离子无干扰。