Masking agents in the spectrophotometric determination of metal ions with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol and non-ionic surfactant

The Analyst ◽  
1989 ◽  
Vol 114 (10) ◽  
pp. 1323 ◽  
Author(s):  
Jun'ichiro Miura
Keyword(s):  
Metal Ions ◽  
Spectrophotometric Determination ◽  
Ionic Surfactant ◽  
Masking Agents

scholarly journals A Double-Line Sequential Injection System for the Spectrophotometric Determination of Copper, Iron, Manganese, and Zinc in Waters

2005 ◽  
Vol 88 (2) ◽  
pp. 639-644 ◽  
Author(s):  
Inês P A Morais ◽  
M Renata S Souto ◽  
António O S S Rangel
Keyword(s):  
Metal Ions ◽  
Spectrophotometric Determination ◽  
Absorption Spectrometry ◽  
Injection System ◽  
Sequential Injection ◽  
Double Line ◽  
Relative Standard ◽  
Iron Manganese ◽  
Determination Of Copper

Abstract A double-line sequential injection system was developed for the spectrophotometric determination of several metal ions in waters. The proposed double-line configuration was used to enable adding sample and chromogenic reagents as merging zones. The methodology was applied to the spectrophotometric determination of copper, iron, manganese, and zinc in samples of diverse origins at the range of 0.15–5.00, 0.10–10.0, 0.48–4.00, and 0.11–5.00 mg/L, respectively. Different chromogenic reagents and detection wavelengths were used. The chromogenic reagents for iron and manganese were 1,10-phenanthroline and formaldoxime, respectively. Copper and zinc were both determined using the analytical reagent zincon. Analytical characteristics of the methodology, such as manifold parameters, buffer pH, and reagent concentrations were optimized, and interference of some of the metal ions commonly present in water sample was assessed. Results of the analysis were in agreement with those obtained by atomic absorption spectrometry. Repeatability, expressed as the relative standard deviation for 10 consecutive injections of water samples, was lower than 6%. The determination rate was approximately 36/h.

On the spectrophotometric determination of with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol

1988 ◽  
Vol 66 (3) ◽  
pp. 401-405 ◽  
Author(s):  
Lumír Sommer ◽  
Eva Šamlotová
Keyword(s):  
Spectrophotometric Determination ◽  
Natural Water ◽  
Water Samples ◽  
Sodium Sulphate ◽  
Optimum Conditions ◽  
Reaction Conditions ◽  
Masking Agents ◽  
Triton X ◽  
Sulphosalicylic Acid

2-(5-Bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) is a suitable reagent for the spectrophotometric determination of uranium but results are easily influenced by the reaction conditions as well as various common ions and masking agents. Optimum conditions, which must be carefully maintained, are 30% (v/v) dimethylformamide, 0.1% triton X-100, ≥ 8 × 10−5 M 5-Br-PADAP, 8 × 10−2 M triethanolamine, 7 × 10−3 M sodium fluoride, 10−2 M 5-sulphosalicylic acid, and 579 nm. Sodium sulphate (10−2 M) and CDTA (5.7 × 10−3 M) may serve as additional masking agents. A previous separation of uranium by extraction with 0.1 M tri-n-octylamine in benzene from 4 M HCl and re-extraction of 0.3 M HCl is recommended for analysis of natural water samples.

Recognition and determination of multi-metal ions based on silver nanoclusters capped by polyethyleneimine with different molecular weights

2015 ◽  
Vol 39 (12) ◽  
pp. 9293-9298 ◽  
Author(s):  
Fei Qu ◽  
Qianqian Zhang ◽  
Jinmao You
Keyword(s):  
Metal Ions ◽  
Silver Nanoclusters ◽  
Molecular Weights ◽  
Masking Agents ◽  
Ag Nanoclusters

Utilizing suitable masking agents, the fluorescence of Ag nanoclusters, quenched from adding Hg2+, Cu2+, Co2+, and Ni2+, could be restored.

Spectrophotometric determination of manganese with 1-(2-pyridylazo)-2-naphthol and a non-ionic surfactant

Talanta ◽  
1977 ◽  
Vol 24 (12) ◽  
pp. 752-753 ◽  
Author(s):  
Katsumi Goto ◽  
Shigeru Taguchi ◽  
Yoko Fukue ◽  
Keiko Ohta ◽  
Hiroto Watanabe
Keyword(s):  
Spectrophotometric Determination ◽  
Ionic Surfactant
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