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Titolo:
Lead in calcium supplements
Autore:
Scelfo, GM; Flegal, AR;
Indirizzi:
Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 z, Santa Cruz, CA 95064 USA
Titolo Testata:
ENVIRONMENTAL HEALTH PERSPECTIVES
fascicolo: 4, volume: 108, anno: 2000,
pagine: 309 - 313
SICI:
0091-6765(200004)108:4<309:LICS>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
BLOOD LEAD; POPULATION; NUTRITION; CADMIUM;
Keywords:
antacids; bonemeal; calcium supplements; dolomite; inductively coupled plasma-mass spectrometry (ICP-MS); infant formulas; lead; nutritional supplements; oyster shell; vitamins;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Scelfo, GM Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 uz, CA 95064 USA
Citazione:
G.M. Scelfo e A.R. Flegal, "Lead in calcium supplements", ENVIR H PER, 108(4), 2000, pp. 309-313

Abstract

Intercalibrated measurements of lead in calcium supplements indicate the importance of rigorous analytical techniques to accurately quantify contaminant exposures in complex matrices. Without such techniques, measurements oflead concentrations in calcium supplements may be either erroneously low, by as much as 50%, or below the detection limit needed for new public health criteria. In this study, we determined the lead content of 136 brands of supplements that were purchased in 1996. The calcium in the products was derived from natural sources (bonemeal, dolomite, or oyster shell) or was synthesized and/or refined (chelated and nonchelated calcium). The dried products were acid digested and analyzed for lead by high resolution-inductivelycoupled plasma-mass spectrometry. The method's limit of quantitation averaged 0.06 mu g/g, with a coefficient of variation of 1.7% and a 90-100% leadrecovery of a bonemeal standard reference material. Two-thirds of chose calcium supplements failed to meet the 1999 California criteria for acceptable lead levels (1.5 mu g/daily dose of calcium) in consumer products. The nonchelated synthesized and/or refined calcium products, specifically antacids and infant formulas, had the lowest lead concentrations, ranging from nondetectable to 2.9 mu g Pb/g calcium, and had the largest proportion of brands meeting the new criteria (85% of the antacids and 100% of the infant formulas).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 03:17:10