Copper(II)-catalysed oxidative coupling reaction of 3-hydroxyacetanilide with 3-methyl-2-benzothiazolinone hydrazone for the spectrophotometric determination of traces of copper(II)

Abstract

A spectrophotometric method is developed for the determination of traces of copper(II), based on the catalytic oxidative coupling reaction of 3-hydroxyacetanilide with 3-methyl-2-benzothiazolinone hydrazone in the presence of ammonia and hydrochloric acid. Beer's law is obeyed in the copper(II) concentration range of 0.008-0.16 microg mL(-1), and the molar absorptivity at 530 nm is 2.5x10(5) L mol(-1) cm(-1). The Sandell's sensitivity of the product is 0.000254 microg cm(-2). The optimum reaction conditions and other important analytical parameters have been investigated. The proposed method is applied to the analysis of water and soil samples and the results are compared with the literature method.

Determination of trace amounts of Cu(II) in drinking and wastewater samples by a novel catalytic kinetic spectrophotometric method

“…The current method is simple and fast, and can be used to determine copper at low levels. The proposed method has the advantages of low cost, a linear range of 30 fold, reproducibility, accuracy and, most importantly, low DLs, comparable with the DLs obtained by the existing catalytic kinetic techniques for the determination of trace quantities of Cu(II) present in water samples [38][39][40][41][42][43][44][45][46][47][48][49] in Table 4. Also, it has a lower reaction temperature and time than the other kinetic methods.…”

Extractive spectrophotometric determination of copper(II) in water and alloy samples with 3-methoxy-4-hydroxy benzaldehyde-4-bromophenyl hydrazone (3,4-MHBBPH)

“…The results of the proposed extractive spectrophotometric method for the determination of Cu(II) in water and alloy samples are presented in Tables II and III. The obtained results were compared with reported methods 29,33 in terms of Student's 't' test and Variance ratio 'f'-test. The analytical data summarised in Tables II and III suggest that the percentage recovery of Cu(II) from water and alloy samples range from 92.5 to 97.2 %, which is more reliable and sensitive than the reported methods.…”

Synergistic extraction and spectrophotometric determination of copper(II) using 1-(2′,4′-dinitro aminophenyl)-4,4,6-trimethyl-1,4-dihydropyrimidine-2-thiol: Analysis of alloys, pharmaceuticals and biological samples

“…However, many metal ions are interfered in the determination procedure of copper(II) [22,27]. Some methods have narrow pH range [20,21,24], require heating of the aqueous phase for full color development [24,27], use of surfactants for the stability of complex [23,24] and require more equilibrium time [26].…”

“…However, many metal ions are interfered, which lacks the selectivity of the method. For spectrophotometric determination of copper(II), the chromogenic reagents such as N-dodecyl-N -(sodium p-aminobenzenesulphonate)-thiourea [24], 2,5-dimercapto-1,3,4-thiadiazole [25], S,S -bis(2-aminophenyl) oxalate [26], 3-methyl-2-benzothiazolinone hydrazone [27], 2,6-bis(4-sulpho-1-hydroxy-2-naphthylazo)pyridine [28] and morpholine-dithiocarbamate are reported to be sensitive chromogenic reagents for copper(II). However, many metal ions are interfered in the determination procedure of copper(II) [22,27].…”

“…For spectrophotometric determination of copper(II), the chromogenic reagents such as N-dodecyl-N -(sodium p-aminobenzenesulphonate)-thiourea [24], 2,5-dimercapto-1,3,4-thiadiazole [25], S,S -bis(2-aminophenyl) oxalate [26], 3-methyl-2-benzothiazolinone hydrazone [27], 2,6-bis(4-sulpho-1-hydroxy-2-naphthylazo)pyridine [28] and morpholine-dithiocarbamate are reported to be sensitive chromogenic reagents for copper(II). However, many metal ions are interfered in the determination procedure of copper(II) [22,27]. Some methods have narrow pH range [20,21,24], require heating of the aqueous phase for full color development [24,27], use of surfactants for the stability of complex [23,24] and require more equilibrium time [26].…”