Atomic Absorption Spectrophotometric Determination of Trace Amounts of Heavy Metals in Food by Extraction with Sodium Diethyldithiocarbamate-Diisobutyl Ketone
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A precise and sensitive analytical method was developed for the determination of heavy metals in food.Diisobutyl ketone (DIBK), which is far less soluble in water compared to methyl isobutyl ketone or n-butyl acetate, was used with sodium diethyldithiocarbamate (DDTC) in the solvent extraction separation-flame atomic absorption spectrometry system. Cadmium, nickel, cobalt, lead and copper in alkaline solution (pH 13) could be extracted with DDTC into DIBK without interference from iron and manganese.The proposed method was satisfactorily applied to the analysis of the environmental reference materials (pepperbush, chlorella and mussel) and some foods. The recoveries of these metals from foods were 95.3-102.6% and the relative standard deviations were 0.2-3.2%. Practical detection limits were generally 0.001μg/g for cadmium, 0.002μg/g for copper and 0.01μg/g for nickel, cobalt and lead.Keywords:
Sodium diethyldithiocarbamate
Methyl isobutyl ketone
Trace Amounts
Methyl isobutyl ketone
Methyl Ketone
Isothermal process
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Methyl isobutyl ketone
Nitric acid
Methyl Ketone
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Lead, cadmium, and thallium are determined in a single 3-ml urine sample. The three metals, simultaneously chelated with sodium diethyldithiocarbamate, are extracted (at pH 3-7) into methyl isobutyl ketone (isopropylacetone), and the carbon rod atomizer, in conjunction with atomic absorption spectrophotometry, is used to analyze the extracts. Small sample requirements (1.6 µl) permit the extraction to be carried out in small-volume disposable glassware, with use of disposable pipets. Within-run coefficients of variation were all less than 5%; recovery ranged from 96-106%. Several normal urinary constituents, added in excess, negligibly affected recoveries. Ethylenediaminetetraacetate in the urine inhibited recovery of lead; this was reversed by adding excess calcium to the urine before extraction. The method of standard additions was used to compensate for differences between standards and unknowns caused by matrix effects.
Thallium
Methyl isobutyl ketone
Spectrophotometry
Matrix (chemical analysis)
Standard addition
Sodium diethyldithiocarbamate
Carbon fibers
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A precise and sensitive analytical method was developed for the determination of heavy metals in food.Diisobutyl ketone (DIBK), which is far less soluble in water compared to methyl isobutyl ketone or n-butyl acetate, was used with sodium diethyldithiocarbamate (DDTC) in the solvent extraction separation-flame atomic absorption spectrometry system. Cadmium, nickel, cobalt, lead and copper in alkaline solution (pH 13) could be extracted with DDTC into DIBK without interference from iron and manganese.The proposed method was satisfactorily applied to the analysis of the environmental reference materials (pepperbush, chlorella and mussel) and some foods. The recoveries of these metals from foods were 95.3-102.6% and the relative standard deviations were 0.2-3.2%. Practical detection limits were generally 0.001μg/g for cadmium, 0.002μg/g for copper and 0.01μg/g for nickel, cobalt and lead.
Sodium diethyldithiocarbamate
Methyl isobutyl ketone
Trace Amounts
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Methyl isobutyl ketone
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In the atomic absorption spectroscopic determination of cadmium, ammonium pyrrolidyldithiocarbamate (APDC) was used as the chelating reagent but it was found that sodium diethyldithiocarbamate (DDTC) was better than APDC. Cadmium pyrrolidyldithiocarbamate was slightly soluble in most organic solvents and fairly soluble only in methyl isobutyl ketone, but cadmium diethyldithiocarbamate was easily soluble in most organic solvents. Therefore, extraction efficiency of cadmium complex from the aqueous solution with methyl isobutyl ketone was very good in the case of cadmium diethyldithiocarbamate. This experimental fact resulted in the simplified procedure and high recovery ratio.
Sodium diethyldithiocarbamate
Methyl isobutyl ketone
Cadmium acetate
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This paper describes the simultaneous determination of lead and cadmium in foods by programmed dry ashing, in the presence of magnesium nitrate, complexing with sodium diethyldithiocarbamate, extraction with isobutyl methyl ketone and atomic-absorption spectrophotometry using the graphite furnace technique. Recoveries are 94–100% for lead and 94–109% for cadmium.
Ashing
Methyl isobutyl ketone
Magnesium nitrate
Spectrophotometry
Sodium diethyldithiocarbamate
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Abstract It has been found that anhydrous mixtures of methyl ethyl ketone with methyl isobutyl ketone can be used as very effective dewaxing solvents. Such a mixture containing 70% methyl isobutyl ketone gives a performance essentially equivalent to that obtained with the much more expensive, yet, up until now, technically preferred methyl n‐propyl ketone. For the same dewaxed oil pour point, dry mixtures of methyl ethyl ketone and methyl isobutyl ketone (and also as described previously methyl n‐propyl ketone) do not require as low filtering temperatures yet give higher filter rates than the widely employed mixtures of methyl ethyl ketone and aromatics. The continuous dehydration of mixtures of methyl ethyl ketone and methyl isobutyl ketone by distillation is also described. This operation is complicated by the fact that methyl ethyl ketone forms a binary, homogeneous azeotrope with water. The process which is described is rather unusual in that it combines some of the features of extractive distillation and also some of those of azeotropic distillation.
Methyl isobutyl ketone
Methyl Ketone
Azeotrope
Azeotropic distillation
Extractive distillation
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A comparative study was made of the solvent extraction of the tetrachloro- and tetrabromoaurate complexes of gold into isobutyl methyl ketone and diisobutyl ketone. The efficiency of the extraction was assessed following the determination of residual gold in the aqueous phase by electrothermal atomic absorption spectrometry. Optimum conditions for solvent extraction were established. Sensitivity and precision data were gathered for gold extracted into isobutyl methyl ketone and diisobutyl ketone by flame atomic absorption spectrometry. Spectral interference data are presented for the co-extraction of iron.
Methyl isobutyl ketone
Liquid–liquid extraction
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTernary vapor-liquid equilibriums at 760 mm Hg in the systems methanol-diethyl ketone-methyl isobutyl ketone and methanol-methyl ethyl ketone-methyl isobutyl ketoneAbraham Tamir and Jaime WisniakCite this: J. Chem. Eng. Data 1980, 25, 4, 393–398Publication Date (Print):October 1, 1980Publication History Published online1 May 2002Published inissue 1 October 1980https://pubs.acs.org/doi/10.1021/je60087a032https://doi.org/10.1021/je60087a032research-articleACS PublicationsRequest reuse permissionsArticle Views57Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Methyl isobutyl ketone
Methyl Ketone
Ternary numeral system
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