A detailed study of precipitation reaction of perchlorate ion with tetraphenylarsonium chloride is reported. Optimum conditions for quantitative precipitation of perchlorate ion were determined. A gravimetric and a spectrophotometric method for perchlorate ion are proposed. The spectrophotometric method is based upon dissolution of ( C.H.),AsClO. in acetonitrile and subsequent measurement of ab...

Large scale application of ammonium-perchlorate in the composite rocket fuels defines this compound as an important strategic material. The high content of oxygen in ammonium-perchlorate (54.5% w/w) and the fact that during the thermal decomposition does not yield solid residue, determines its application as an exceptional and irreplaceable oxidative compound in the composite rocket fuels. The ...

Perchlorate and iodide concentrations were determined in brown (Undaria pinnatifida and Laminaria japonica) and red (Porphyra sp.) edible seaweeds, which are commonly consumed by Korean people, with the use of ion chromatography, coupled with a tandem mass spectrometer. Seaweeds (i.e., good sources of iodine) are among the most important plant life in the ocean and commonly consumed as food and...

Perchlorate can be destroyed by Advanced Reduction Processes (ARPs) that combine chemical reductants (e.g., sulfite) with activating methods (e.g., UV light) in order to produce highly reactive reducing free radicals that are capable of rapid and effective perchlorate reduction. However, natural organic matter (NOM) exists widely in the environment and has the potential to influence perchlorate...

The dismutation of chlorite into chloride and O(2) represents a central step in the reductive pathway of perchlorate that is common to all dissimilatory perchlorate-reducing bacteria and is mediated by a single enzyme, chlorite dismutase. The chlorite dismutase gene cld was isolated and sequenced from the perchlorate-reducing bacterium Dechloromonas agitata strain CKB. Sequence analysis identif...

Perchlorate (ClO4-) competitively inhibits the uptake of iodide by the thyroid gland. Trace quantities of perchlorate are being increasingly detected in food and environmental samples. There is great concern that perchlorate contamination may be far more widespread than believed until now. Increasingly sensitive and unambiguous methods are needed for measuring perchlorate. We report here an ion...

the mechanistic aspects of the electrochemical reduction of u(v1) nitrate at a mercury electrode in chloroform, using three different supporting electrolytes, are described. in the presence of tetrabutylarnmonium perchlorate (tbap) as a neutral electrolyte, uo (no ) , reduced in two irreversible electrochemical steps to form a u(v1)-u(v) binuclear complex and u(iv), respectively. in the presenc...

A method for the analysis of perchlorate in plants was developed, based on dry weight, and applied to the analysis of plant organs, foodstuffs, and plant products. The method reduced greatly the ionic interferences in water extracts of plant materials. The high background conductivity, due to the plant matrix, was reduced sufficiently to allow quantitation of perchlorate with little or no matri...

1. Treatment of a partly purified preparation of rat liver monoamine oxidase with the chaotropic agent sodium perchlorate caused the enzyme to migrate as a single band of activity on polyacrylamide-gel electrophoresis, whereas the untreated enzyme separated into a number of bands. 2. Treatment with the chaotropic agent caused no loss ofenzyme activity towards benzylamine, dopamine or tyramine. ...

The absence of significant detectable signatures organic molecules in the atmosphere and on surface Mars is a major unsolved puzzle. One possible explanation that perchlorate-rich Martian soils, activated by solar ultraviolet (UV) radiation, create an environment favorable for rapid oxidation organics such as alkanes (including methane or CH4). In this paper, we measured product formation rates...