Recovery Of Cadmium Research Articles

Determination of Cadmium, Zinc, Copper, Lead, Arsenic and Chromium in Fishery Products by Fluorescent X-ray Spectrometry

Fluorescent X-ray spectrometry has been developed for the-rapid analysis of fishery preducts. Samples of fishery preducts were hemogenized with a Patter's homegenizer and dried under an infrared lamp in a draft-chamber. After pulverized by mixer-mill, a portion of sample was compressed at 15 t/cm2, and subjected to the determination of metal elements by fluorescent X-ray spectrometry, The intensity ratio of K. or L. line of the e!ements to be analyzed to scattered lines near the fluorescent line was used to compenzation of matrix effect of fluorescent X-ray. The standard deation of ana1ytical data for each: metals was within 5%. The recoveries of cadmium, lead, and chromium, obtained by adding 20 ptg/g of these nietals were 95.0-1O6.0%, 93.5-101.5%. and 96.0-1O5.0% respectively. Detection limit was O.2-O.5ptg/g (fresh sample, measurement time; 10-1OOsec). This value can be improved by the elongation of measurement time. The results obtained by the proposed method agreed almost with those obtained by atomic absorption analysis, while pretreatent procedureof this method was far more rapid and simple than any other conventional ones.

Cadmium Analysis of Dried Milk by Pulse Polarographic Techniques

The applicability of differential pulse anodic stripping voltammetry for the determination of little cadmium in milk has been demonstrated. Sample preparation included dry ashing and dissolving the ash in hydrochloric acid. Highest recovery of cadmium was with ashing temperatures between 500 and 540C. Cadmium recovery was 94% on milk powder spiked at 10 parts per billion (ppb) and 86% on powder spiked at 2 ppb. Samples of foam spray-dried skim milk and freeze-dried whole milk contained less than 3 ppb cadmium on a dry weight basis.

The separation and recovery of zinc and cadmium from chloride liquors by solvent extraction

The distributions of tracer and macro quantities of zinc (II) and cadmium (II) between aqueous solutions of sodium chloride and a selection of the most important commercial extraction agents, plus a few of the more promising recently-introduced extractants in a variety of suitable diluents, have been measured. These results have been compared with the extraction and separation of these two metals from a practical plant liquor arising from a fume-scrubbing unit attached to a zinc smelter. It is concluded that the neutral solvating agents will extract zinc prefentially to gave a product of high purity e.g. TBP (tri-n-butyl phosphate), TOPO (tri-n-octyl phosphine oxide).However cadmium, relatively free of iron and zinc, may be obtained by the extraction with liquid anion exchangers, particularly the tertiary amines. Résumé La distribution de traces et de macroquantites de zinc (II) et de cadmium (II) entre des solutions aqueuses de NaCl et une selection d'agents d'extraction commer-ciaux a été mesurée. Les agents d'extraction choisis étaient les plus importants et les plus prometteurs récemment introduits sur le marché. Les résultats ont été comparés avec l'extraction et la séparation de ces deux métaux d'une liqueur industrielle. On peut conclure que l'agent solvant neutre, tel Ie TBP (tri-n-butyl phosphate) et Tapa (tri-n-octyl phosphine oxyde), extrait Ie zinc préférentiellement et donne un produit de haute pureté.Cependant du cadmium relativement exempt de fer et de zinc peut être obtenu par extraction avec un liquide échangeur d'anions, particulièrement d'amines tertiaires.

The separation and recovery of zinc and cadmium from chloride liquors by solvent extraction

The distributions of tracer and macro quantities of zinc (II) and cadmium (II) between aqueous solutions of sodium chloride and a selection of the most important commercial extraction agents, plus a few of the more promising recently-introduced extractants in a variety of suitable diluents, have been measured. These results have been compared with the extraction and separation of these two metals from a practical plant liquor arising from a fume-scrubbing unit attached to a zinc smelter. It is concluded that the neutral solvating agents will extract zinc prefentially to gave a product of high purity e.g. TBP (tri-n-butyl phosphate), TOPO (tri-n-octyl phosphine oxide).However cadmium, relatively free of iron and zinc, may be obtained by the extraction with liquid anion exchangers, particularly the tertiary amines. Résumé La distribution de traces et de macroquantites de zinc (II) et de cadmium (II) entre des solutions aqueuses de NaCl et une selection d'agents d'extraction commer-ciaux a été mesurée. Les agents d'extraction choisis étaient les plus importants et les plus prometteurs récemment introduits sur le marché. Les résultats ont été comparés avec l'extraction et la séparation de ces deux métaux d'une liqueur industrielle. On peut conclure que l'agent solvant neutre, tel Ie TBP (tri-n-butyl phosphate) et Tapa (tri-n-octyl phosphine oxyde), extrait Ie zinc préférentiellement et donne un produit de haute pureté.Cependant du cadmium relativement exempt de fer et de zinc peut être obtenu par extraction avec un liquide échangeur d'anions, particulièrement d'amines tertiaires.

The determination of trace amounts of zinc, cadmium, lead and copper in airborne particulate matter by anodic stripping voltammetry

The application of anodic stripping voltammetry, with a hanging mercury drop electrode, to the determination of zinc, cadmium, lead and copper in airborne particulate matter collected by filtration is discussed. This procedure allows for the destruction of the filter material followed by the complete dissolution (including silicates) of the collected particulate matter. A low-temperature ashing process is described and the recovery of cadmium in this procedure is studied. Analytical data obtained by anodic stripping and atomic absorption for zinc, cadmium, lead and copper are compared.

Determination of cadmium in waste water by dithizone extraction method

In the course of analysis of waste water, we noticed occasionally concerning some samples extraordinarily low recovery of cadmium. We revealed that the coexistence of iron and manganese interfered seriously with the extraction of cadmium by dithizone. To remove this interference, cadmium was retained in the strongly basic anion exchangers from hydrochloric acid solution of the sample and then eluted by nitric acid. Cadmium was determined accurately in the effluent according to the ordinary dithizone method.

Cadmium recovery by ion exchange

The production of refined cadmium from sinter-plant fume using weak sulfuric-acid leaching followed by ion-exchange purification and concentration.

Cadmium Production in Mexico

A description of the chloride extraction process for the recovery of cadmium from lead blast-furnace fume at the Penoles smelter, Torreon, Mexico. Removal of impurities, and the production of oxide are also discussed.

Spectrophotometric determination of micro amounts of cadmium in cast iron.

シアン化物の存在で,ジエチルジチオカルバミン酸塩-四塩化炭素抽出を行なうとき,ホルマリンを加えると亜鉛は抽出されず,カドミウムのみが抽出される.そのさい少量のビスマスを加えると,カドミウムの回収率がよくなる.これを鋳鉄中のカドミウムを定量するさいの亜鉛との分離に応用した.カドミウムはシアン化物を含む溶液から,ジチゾンークロロホルムで抽出し,光度定量した.

Cadmium practice at Great Falls

Cadmium metal, for which the demand has increased many fold in the past several years, is a byproduct of zinc electrolysis. Here is presented the story of cadmium recovery and production in the electrolytic zinc plant of the Anaconda Co.’s Great Falls plant.

Selective sulfation for cadmium recovery at Josephtown Smelter

Investigation of the autogentic sulfation of cadmium oxide by zinc sulfate has disclosed the existence of a sulfation series in which sulfates higher in the series will, upon heat treatment of a mixture, sulfate oxides of metals lower in the series. An early commercial application of this research at Josephtown Smelter is described.

Cadmium Recovery Practice at the Donora Zinc Works

Cadmium Recovery Practice at the Donora Zinc Works

The recovery of cadmium from cadmium-copper precipitate, Electrolytic Zinc Co. of Australasia, Risdon, Tasmania

The recovery of cadmium from cadmium-copper precipitate, Electrolytic Zinc Co. of Australasia, Risdon, Tasmania

Cadmium recovery practice in lead smelting

Cadmium recovery practice in lead smelting