Autoclave digestion procedure for the determination of total iron content of waters

Crowther, Joan

doi:10.1021/ac50026a032

Cited by 9 publications

(1 citation statement)

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“…However, the autoclave is generally more affordable than lab microwaves. The ability of the autoclave to break down organic matter is well known and it can be used to digest organic matter and compounds such as urine, if it is used with a proper digestion solvent (Jeffries, Dieken, and Jones 1979;Crowther 1978;Navarrete-López et al 2012). Using an autoclave to extract iodine from samples is uncommon in the literature (Haldimann, Eastgate, and Zimmerli 2000); therefore, the evaluation of this technique with respect to iodine recovery was necessary to ensure all iodine remained in the sample.…”

Section: Extraction Formulamentioning

confidence: 99%

A Rapid and Efficient Autoclave Pre-Treatment to Extract Iodine-129 from Urine Samples for AMS Analysis

Alotaibi

Mn²,

Rj³

2020

Preprint

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A new method was developed to extract 129I from urine samples and then measure it by AMS. The samples were pre-treated in an autoclave with hydrogen peroxide to remove unwanted compounds from the urine samples and were acidified with nitric acid, followed by precipitation of iodine as silver iodide (AgI) for measurement by AMS. This new procedure is substantially faster than previous methods for the extraction of iodine from urine and results in less chemical waste. The efficiency and reproducibility of this method were evaluated by using 125I as a yield tracer, eventually giving a recovery above 99%. To achieve this, several iterations of the method were required. The method was then successfully applied to measure 129I/127I isotopic ratios and 129I concentrations in 25 human urine samples. The AMS results for 129I in urine ranged 3.3 x 106 atoms/L to 884 x 106 atoms/L and the isotope ratio (129I/127I) in human urine ranged from 7.38 x 10-12 to 3.97 x 10-10 with a median of 1.29 x 10-10. This new method will be useful for investigations into the sources of iodine in the human diet and their relative importance for iodine sufficiency.

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