Report on Zinc

Taylor, L. V.; Alexander, O. R.

doi:10.1093/jaoac/28.2.271

Cited by 1 publication

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“…However, it is extremely time-consuming, involving many extractions and precipitations, and does not have special advantages. Since it has already been subjected to a critical collaborative study (31), it was not considered further experimentally. Results of duplicate analyses from seven dif- The accuracies of the individual laboratory runs were not this good, but are comparable to Method 1.…”

Section: Ratio Of Impuritiesmentioning

confidence: 99%

Evaluation of Methods for Trace Zinc Determination

Margerum¹,

Sentacana²

1960

Anal. Chem.

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b Methods for determination of microgram quantities of zinc are experimentally evaluated. The preferred method uses bis(2-hydroxyethy1)dithiocarbamate (diethanoldithiocarbamate) masking with dithizone extraction and a single color method; 30 pg. of zinc are determined with an accuracy of 99.0 =t 1.8% (for duplicate samples with 95% confidence limits) in the presence of a tenfold excess of each of the following: cadmium, cobalt, copper, mercury, nickel, lead, iron, manganese, chromium, and tin. Because zinc is a common contaminator of reagents, the true efficiency of zinc separation procedures is proved with zinc-65. Radiozinc also elucidates the difference in behavior of diethyldithiocarbamate and diethanoldithiocarbamate as masking agents in dithizone extractions. The use of Zincon for zinc determinations is not recommended unless a limited number of impurities are present.HIS WORK compares and evaluates T methods for the determination of microgram quantities of zinc in the presence of an excess of a Ride range of metallic impurities. The chemical behavior of these methods is elucidated where helpful. The methods considered were limited to those adaptable to the determination of 1 to 100 pg. of Zn in solution with concentrations as low as 0.1 p.p.m. and to those with good accuracy (relative error less than 10%). Determinations without separations did not meet these limitations and the only suitable separations were dithizone extractions in the presence of various masking agents, anion elchange resin elution with hydrocliloric acid, and certain sulfide precipitations.Since Zn is a very common contaminator of reagents and of water, it is not knomn whether many separation procedures are truly efficient or if they merely give reproducible distribution of zinc in the various steps. For this reason several separation procedures have been tested with radiozinc to determine the total loss of Zn in a determination and to locate operations which might be particularly susceptible to error due t o incomplete separation.

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Section: Ratio Of Impuritiesmentioning

confidence: 99%