Evaluation of clays as binding agents for reduction of radionuclides in milk. Binding properties of clays with cesium-134 in artificial rumen and in simulated abomasal and intestinal fluids, and uptake of cesium-134 by rumen microflora

Barth, Julius; Bruckner, Benjamin H.

doi:10.1021/jf60166a008

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…A number of studies have considered the use of in vitro rumen liquor incubations as a method of determining radiocesium bioavailability (26)(27)(28) and also the radiocesium binding abilities of different clays (29). All of the studies to determine radiocesium bioavailability used rumen liquor obtained from sheep incubated at a temperature between 37 and 39°C; incubation times ranged from 1 to 48 h. Different soil types were extracted using rumen liquor incubations by Cooke et al (28); a range of conditions including the control of pH were studied.…”

Section: Radiocesiummentioning

confidence: 99%

The Importance of Source-Dependent Bioavailability in Determining the Transfer of Ingested Radionuclides to Ruminant-Derived Food Products

Beresford

Mayes

Cooke

et al. 2000

Environ. Sci. Technol.

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The transfer of radioactivity to the milk and meat of farm animals is likely be a major exposure pathway of human populations, following an environmental release of radioactivity. The importance of source-dependent bioavailability in determining absorption from the ruminant gastrointestinal tract of the radiologically significant radionuclides (radiocesium, radiostrontium, radioiodine, and plutonium) is reviewed. The requirements for and suitability of in vitro methods of determining bioavailability for absorption of these radionuclides is also assessed. Radiocesium absorption varies over a 50-fold range, depending upon dietary source. Source-dependent bioavailability is therefore an important factor in determining the radiocesium contamination of ruminant-derived food products, and reliable in vitro techniques have been developed to rapidly determine its bioavailability. In contrast, under conditions of adequate calcium intake, the absorption of radiostrontium will not be greatly influenced by the dietary source. Results of in vitro extractions of radiostrontium could be misleading, as they indicate differences in bioavailability that are not observed in the animal. Absorption of radioiodine is complete and independent of source. There is currently a lack of data on plutonium absorption in ruminants. However, on the basis of the limited data available, in vitro incubations provide a measure of the relative bioavailabilities of plutonium from different sources. The applicability of the techniques reviewed to the study of other radionuclides and heavy metals is discussed.

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Section: Radiocesiummentioning

confidence: 99%

The Importance of Source-Dependent Bioavailability in Determining the Transfer of Ingested Radionuclides to Ruminant-Derived Food Products

Beresford

Mayes

Cooke

et al. 2000

Environ. Sci. Technol.

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“…Although radiocesium is concentrated by certain bacteria and other plants, in vitro experiments by Barth and Bruckner (1969b) showed that 134Cs was not concentrated by rumen microflora in an artificial rumen.…”

Section: Mrazmentioning

confidence: 99%

“…reported that bentonite fed to rats greatly increased fecal excretion of subcutaneously administered 134Cs. Barth and Bruckner (1969b) reported that natural Belle Fourche bentonite bound a considerable portion of the 134Cs in an artificial rumen and simulated bovine abomasal and intestinal fluids. Barth and Bruckner (1969a) also reported that in the same system, Belle Fourche bentonite increased the Ca2^ion levels and had little effect on the levels of Mg2+, K+, and Na+.…”

Section: Mrazmentioning

confidence: 99%

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Evaluation of clays as binding agents for reduction of radionuclides in milk. Effect of Belle Fourche bentonite on excretion of cesium-134 in lactating goats

Barth¹,

Mikalis²,

Harris³

et al. 1969

J. Agric. Food Chem.

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Sodium montmorillonite (Belle Fourche bentonite)concentrate. The blood levels and urinary exeffectively reduced the secretion of a single oral cretion of 1 3 C s were reduced and the fecal exdose of 1 3 C s in the milk of lactating goats when cretion of 134Cs was increased considerably.added to the ration at levels of 4 % and 8 of the M raz and Patrick (1957) reported that bentonite fed to rats greatly increased fecal excretion of subcutaneously administered 134Cs. Barth and Bruckner (1969b) reported that natural Belle Fourche bentonite bound a considerable portion of the 1 3 C s in a n artificial rumen and simulated bovine abomasal and intestinal fluids. Barth and Bruckner (196%) also reported that in the same system, Belle Fourche bentonite increased the Ca2-ion levels and had little effect on the levels of Mg2+, K+, and Na+.Although radiocesium is concentrated by certain bacteria and other plants, in ritro experiments by Barth and Bruckner (1969b) showed that 1 3 C s was not concentrated by rumen microflora in an artificial rumen. This suggested that almost all of the radiocesium in rumen juice is in a form available to be acted upon by binding agents in the rumen. As indicated by in ritro studies by Barth and Bruckner (1969b), the rumen is the most favorable site in the digestive tract for the binding of radiocesium by natural Belle Fourche bentonite.Hazzard (1966) reported that verxite, another clay material, reduced l'j4Cs excretion in the milk of goats.This paper describes the effects of natural Belle Fourche bentonite added to feed on the secretion and excretion of a n orally administered dose of la4Cs in lactating goats. P ROC ED L R E

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Chemical methods to reduce the radioactive contamination of animals and their products in agricultural ecosystems

Voigt

1993

Science of The Total Environment

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Evaluation of clays as binding agents for reduction of radionuclides in milk. Binding properties of clays with cesium-134 in artificial rumen and in simulated abomasal and intestinal fluids, and uptake of cesium-134 by rumen microflora

Cited by 3 publications

References 5 publications

The Importance of Source-Dependent Bioavailability in Determining the Transfer of Ingested Radionuclides to Ruminant-Derived Food Products

The Importance of Source-Dependent Bioavailability in Determining the Transfer of Ingested Radionuclides to Ruminant-Derived Food Products

Evaluation of clays as binding agents for reduction of radionuclides in milk. Effect of Belle Fourche bentonite on excretion of cesium-134 in lactating goats

Chemical methods to reduce the radioactive contamination of animals and their products in agricultural ecosystems

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