The present paper describes the preparation of new organic reagent 2-[2-（6-chloro benzothiazolyl） azo]-resorcinol （6-CIBTAR = LH2） and used for the spectrophotometric determination of traces microgram amount of ni...The present paper describes the preparation of new organic reagent 2-[2-（6-chloro benzothiazolyl） azo]-resorcinol （6-CIBTAR = LH2） and used for the spectrophotometric determination of traces microgram amount of nickel （II） and copper （II） was found to form Ni（II）-CIBTAR at pH 7.5 giving a green coloured complex with maximum absorption at wavelength 636 nm and copper （II） was found to from Cu（II）-CIBTAR at pH 6.5 giving green bluish coloured complex with maximum absorption at wavelength 648 nm. The molar absorptivity （~） of the complexes are 0.3695 ~ 104 L.moll-cml and 0.3933 ~ 154 L＇mol＇l.cm1 for Ni（II） and Cu（II） respectively. Calibration curves for the determination of nickel（II） and copper （II） conformed to beers law over the concentration rang of （1-20） μg.mL-1. The DL （detection limit）, RSD （relative standard deviations）, RE （relative errors） and recovery for Ni（II） and Cu（II） complexes were found to be D.L = 0.45, 0.61; R.S.D% = 1.81, 2.04; Erei% = 1.3, 0.86 and Re% = 98.7, 99.14 respectively. The analytical data show the metal to reagent ratio （mole ratio method; M：L） in Ni（II） and Cu（II） complexes are 1：2.展开更多
A new triazene reagent 1-(6-ethoxyl-2-benzothiazolyl)-3-(4-nitrophenyl)-triazene (EtOBThTPT) has been synthesized. The colour reaction of EtOBTNPT with Hg(II) has been studied. At pH = 10.1-10.7, in the presence of Tr...A new triazene reagent 1-(6-ethoxyl-2-benzothiazolyl)-3-(4-nitrophenyl)-triazene (EtOBThTPT) has been synthesized. The colour reaction of EtOBTNPT with Hg(II) has been studied. At pH = 10.1-10.7, in the presence of Triton X-100, the reagent with Hg(II) forms an orange-yellow complex with high sensitivity. The molar absorptivity is 2.38 X 10(5) L.mol(-1).cm(-1). Beer's law is obeyed for Hg(II) in the range of 0-7 mu g/25 ml.展开更多
This paper introduces the synthesis of a new color reagent 1-(6-nitro-2-benzothiazolyl)3-(4-nitrophenyl)-triazene (NBTNPT) and the color reaction of NBTNPT with Cd (II) has been studied. In the presence of Triton X-10...This paper introduces the synthesis of a new color reagent 1-(6-nitro-2-benzothiazolyl)3-(4-nitrophenyl)-triazene (NBTNPT) and the color reaction of NBTNPT with Cd (II) has been studied. In the presence of Triton X-100, the reagent with Cd (II) forms an orange-yellow complex (1:1) at pH=11.5-12.3, the molar absorptivity is 2.81x10(5)L . mol(-1)m(-1) by dual-wavelength spectrophotometry, Beers law is obeyed in the range of 0-280 mu g/L for Cd (II).展开更多
Ⅰ. INTRODUCTION 4-(2-Thiazolylazo)-resorcinol (TAR)can form colored complexes with many metal ions and has been widely used as a color producing reagent for spectrophotometry. Most of its complexes with metal ions ha...Ⅰ. INTRODUCTION 4-(2-Thiazolylazo)-resorcinol (TAR)can form colored complexes with many metal ions and has been widely used as a color producing reagent for spectrophotometry. Most of its complexes with metal ions have the maximum absorbance within the wavelengths of 500—550 nm and molar absorptivities of 2×10~4—6×10~4.展开更多
文摘The present paper describes the preparation of new organic reagent 2-[2-（6-chloro benzothiazolyl） azo]-resorcinol （6-CIBTAR = LH2） and used for the spectrophotometric determination of traces microgram amount of nickel （II） and copper （II） was found to form Ni（II）-CIBTAR at pH 7.5 giving a green coloured complex with maximum absorption at wavelength 636 nm and copper （II） was found to from Cu（II）-CIBTAR at pH 6.5 giving green bluish coloured complex with maximum absorption at wavelength 648 nm. The molar absorptivity （~） of the complexes are 0.3695 ~ 104 L.moll-cml and 0.3933 ~ 154 L＇mol＇l.cm1 for Ni（II） and Cu（II） respectively. Calibration curves for the determination of nickel（II） and copper （II） conformed to beers law over the concentration rang of （1-20） μg.mL-1. The DL （detection limit）, RSD （relative standard deviations）, RE （relative errors） and recovery for Ni（II） and Cu（II） complexes were found to be D.L = 0.45, 0.61; R.S.D% = 1.81, 2.04; Erei% = 1.3, 0.86 and Re% = 98.7, 99.14 respectively. The analytical data show the metal to reagent ratio （mole ratio method; M：L） in Ni（II） and Cu（II） complexes are 1：2.
文摘A new triazene reagent 1-(6-ethoxyl-2-benzothiazolyl)-3-(4-nitrophenyl)-triazene (EtOBThTPT) has been synthesized. The colour reaction of EtOBTNPT with Hg(II) has been studied. At pH = 10.1-10.7, in the presence of Triton X-100, the reagent with Hg(II) forms an orange-yellow complex with high sensitivity. The molar absorptivity is 2.38 X 10(5) L.mol(-1).cm(-1). Beer's law is obeyed for Hg(II) in the range of 0-7 mu g/25 ml.
文摘This paper introduces the synthesis of a new color reagent 1-(6-nitro-2-benzothiazolyl)3-(4-nitrophenyl)-triazene (NBTNPT) and the color reaction of NBTNPT with Cd (II) has been studied. In the presence of Triton X-100, the reagent with Cd (II) forms an orange-yellow complex (1:1) at pH=11.5-12.3, the molar absorptivity is 2.81x10(5)L . mol(-1)m(-1) by dual-wavelength spectrophotometry, Beers law is obeyed in the range of 0-280 mu g/L for Cd (II).
文摘Ⅰ. INTRODUCTION 4-(2-Thiazolylazo)-resorcinol (TAR)can form colored complexes with many metal ions and has been widely used as a color producing reagent for spectrophotometry. Most of its complexes with metal ions have the maximum absorbance within the wavelengths of 500—550 nm and molar absorptivities of 2×10~4—6×10~4.
