Study on the Liquid‐Solid Flotation Separation of Cadmium by Ammonium Sulfate‐Potassium Iodide‐Cetylpyridine Chloride‐Water System

Abstract

The liquid‐solid flotation separation behaviors of Cd2+ in ammonium sulfate‐potassium iodide‐cetylpyridine chloride‐water system and the conditions for the separation of Cd2+ from other metal ions were studied. The results showed that in the presence of 1.0 g (NH4)2SO4 and when the dosage of 0.1 M potassium iodide was 2.0 mL and 0.01 M cetylpyridine chloride (CPC) solution was 1.0 mL respectively, the formed water‐insoluble ternary association complex of KI‐CPC‐Cd floated above water phase and liquid‐solid phases were formed with clear interface. In this condition, Zn2+, Mn2+, Fe2+, Co2+, Ni2+ and Al3+ could not be floated and Cd2+ was floated quantitatively at pH 5.0. Therefore, the quantitative separation of Cd2+ from the above metal ions could be achieved. The quantitative flotation separation determination of Cd2+ in the sample of synthetic water and industrial waster water was performed, and the results agreed well with those by AAS method. The recoveries were 97.2%∼102.4%, and the RSD was 1.8%.

Flame atomic absorption spectrometric determination of zinc, nickel, iron and lead in different matrixes after solid phase extraction on sodium dodecyl sulfate (SDS)-coated alumina as their bis (2-hydroxyacetophenone)-1, 3-propanediimine chelates

“…pH is one of the important factors which affect the efficiency of retention/elution metal ions by solid phase extraction [25][26][27][28][29]. The effect of pH was studied by varying pH in the range of 3-9.…”

Study on Flotation Separation of Mercury (II) by sodium chloride- potassium iodide-octadecyl trimethyl ammonium chloride system

“…There are meny other methods to separate and enrich Hg(II),such as extraction separation [1][2] , column-chromatographic separation [3] , solid phase extraction separation [4] ,chromatographic separation [5] ,micellar high-performance liquid chromatography [6] .But all the aforesaid methods have used a organic solvent as extractant or need complicated instrumentation. Salt-ternary association complex-water system not only has the advantages of liquid-solid extraction system without organic solvent [7][8] , but also has characteristics such as rapid split-phase rate and clear interface between phases and less reagent.There have been some reports about flotation separation of metal ions by salt-ternary association complex-water system [9][10][11] .…”

“…There are meny other methods to separate and enrich Hg(II),such as extraction separation [1][2] , column-chromatographic separation [3] , solid phase extraction separation [4] ,chromatographic separation [5] ,micellar high-performance liquid chromatography [6] .But all the aforesaid methods have used a organic solvent as extractant or need complicated instrumentation. Salt-ternary association complex-water system not only has the advantages of liquid-solid extraction system without organic solvent [7][8] , but also has characteristics such as rapid split-phase rate and clear interface between phases and less reagent.There have been some reports about flotation separation of metal ions by salt-ternary association complex-water system [9][10][11] .In this paper we have studied the flotation separation of mercury(II) by sodium chloridepotassium iodide-octadecyl trimethyl ammonium chloride system.The results showed that in the presence of 0.5 g NaCl,water-insoluble ternary association complex of (OTMAC) could be separated successfully from those metal ions without any masking agent by flotation at pH 3.0. A method of flotation separation of mercury(II) was established,and it has been used for the flotation separation of mercury (II) in the sample of synthetic water with satisfactory results.…”

Study on Flotation Separation and Determination of Mercury (II) by Sodium Bromide-Ammonium Thiocyanate-Octadecyl Trimethyl Ammonium Bromide System

“…There are meny other methods to separate and enrich Hg(II),such as extraction separation [1][2] ,column-chromatographic separation [3] , solid phase extraction separation [4] ,chromatographic separation [5] ,micellar high-performance liquid chromatography [6] .But all the aforesaid methods have used a organic solvent as extractant or need complicated instrumentation. Salt-ternary association complex-water system not only has the advantages of liquid-solid extraction system without organic solvent [7][8] , but also has characteristics such as rapid split-phase rate and clear interface between phases and less reagent.There have been some reports about flotation separation of metal ions by salt-ternary association complex-water system [9][10] .…”