Study on Separation/Enrichment of Copper (II) Using Microcrystalline Phenolphthalein Loaded with Cupferron

2013 ◽  
Vol 807-809 ◽  
pp. 456-460
Author(s):  
Xin Rong Wen ◽  
Chang Qing Tu
Keyword(s):  
Metal Ions ◽  
Water Samples ◽  
Environmental Water ◽  
Environmental Water Samples ◽  
Optimum Conditions ◽  
Experimental Conditions ◽  
Quantitative Separation ◽  
Novel Method

The paper presents a novel method for the separation/enrichment of trace Cu2+ using microcrystalline phenolphthalein loaded with cupferron (Cup) prior to the determination by spectrophoto- metry. The effects of different parameters,such as the dosages of phenolphthalein and Cup and acidity on the enrichment yield of Cu2+ have been investigated to select the experimental conditions. The possible enrichment mechanism of Cu2+ was discussed.The results showed that under the optimum conditions, Cu2+ could be quantificationally adsorbed on the surface of microcrystalline phenolphthalein in the form of the chelate precipitate of Cu (Cup)2 ,while Ni2+,Zn2+,Mn2+,Fe2+ and Al3+ could not be adsorbed at all.Therefore,Cu2+ was completely separated from the above metal ions in the solution. The quantitative separation/enrichment and determination of Cu2+ in various environmental water samples was performed, and the results agreed well with those obtained by FAAS method.

Study on Determination of Trace Cobalt in Environmental Water Samples after Separation/Enrichment Using Microcrystalline Phenolphthalein Modified with 8-Hydroxyquinoline

2013 ◽  
Vol 316-317 ◽  
pp. 279-285
Author(s):  
Xin Rong Wen ◽  
Chang Qing Tu
Keyword(s):  
Metal Ions ◽  
Spectrophotometric Determination ◽  
Water Samples ◽  
Environmental Water ◽  
New Method ◽  
Environmental Water Samples ◽  
Optimum Conditions ◽  
Experimental Conditions ◽  
Novel Method

The paper presents a novel method for the separation/enrichment of trace Co2+ using microcrystalline phenolphthalein modified with 8-hydroxyquinoline (HQ) prior to the determination by spectrophotometry. The effects of different parameters,such as the dosages of phenolphthalein and HQ,various salts and acidity on the enrichment yield of Co2+ have been investigated to select the experimental conditions. The possible enrichment mechanism of Co2+ was discussed.The results showed that under the optimum conditions, Co2+ could be quantificationally adsorbed on the surface of microcrystalline phenolphthalein in the form of the chelate precipitate of Co(HQ)2 ,while K+,Na+,Ca2+,Mg2+,Cd2+,Zn2+,Mn2+,Fe2+ and Al3+ could not be adsorbed at all.Therefore,Co2+ was completely separated from the above metal ions in the solution. A new method for the spectrophotometric determination of trace cobalt after separation/enrichment using microcrystalline phenolphthalein modified with 8-hydroxyquinoline was established.The proposed method has been successfully applied to the determination of Co2+ in various environmental water samples, and the results agreed well with those obtained by FAAS method.

Study on Flotation Separation and Determination of Trace Copper in Water Samples Using Microcrystalline Adsorption System

2014 ◽  
Vol 1010-1012 ◽  
pp. 136-141
Author(s):  
Yu Jun Zhong ◽  
Xin Rong Wen
Keyword(s):  
Ascorbic Acid ◽  
Water Samples ◽  
Salt Water ◽  
Environmental Water ◽  
Separation Mechanism ◽  
Adsorption System ◽  
Optimum Conditions ◽  
Novel Method ◽  
Cetyl Pyridinium

The paper presents a novel method for the flotation separation of Cu2+ using microcrystalline adsorption system and the determination of trace Cu2+ in water samples by spectrophotometry. The effects of the dosages of KI, ascorbic acid (AA) and cetyl pyridinium chloride (CPC),various salts and acidity on the flotation yield of Cu2+ have been investigated. The possible flotation separation mechanism of Cu2+ was discussed.The results showed that under the optimum conditions, CPC cation (CPC+) reacted with I- to produce the microcrystalline matter (Ms-M) of (CPC+·I-),Cu2+ could be reduced to Cu+ by ascorbic acid,and then Cu+ reacted with I- to form the precipitation of CuI.The precipitation of CuI was quantificationally adsorbed on the surface of Ms-M of (CPC+·I-) and was floated above salt-water phase. While Zn2+、Ni2+、Co2+、Mn2+ and Fe2+ could not be floated.Therefore, Cu2+ was separated completely from the above metal ions. The proposed method has been successfully applied to the determination of trace Cu2+ in various environmental water samples after flotation separation using microcrystalline adsorption system, and the results agreed well with those obtained by GFAAS method.The recoveries were 97.9%~100.7%, and the RSD is 0.8%~1.3%.

Sign in / Sign up

Export Citation Format

Share Document