Back to Top. 1  These are the waves which are having the lowest frequency in the electromagnetic spectrum. They are given out by transmitter. 2  They are formed as a result of thunder, lightning etc. 3  They are used in communication mostly.  They are of four types of radio waves 1  namely: Long wave.  Medium 1  wave. Ultra high frequency  (UHF)
What is the role of arsenic in the mining industry . Arsenic is a naturally occurring element commonly found as an impurity in metal ores, and is produced commercially for use in pesticides, wood preservatives, and , Get Price arsenic - definition of arsenic by Medical dictionary
Arsenic has been observed in groundwater in association with petroleum-impacted aquifers at a variety of sites. During anaerobic biodegradation of hydrocarbons, Fe(III)-reducing microorganisms can couple the reduction of solid phase Fe(III)-oxides to soluble Fe(II) with the oxidation of petroleum compounds.he resulting mass loading is calculated to be 17.35 grams per year or 4.15 x 10 -5 grams per year per square foot. The associated predicted groundwater concentration is 1.8 Âµg/L. These results correlate well with the low concentrations of arsenic observed in groundwater across most of the refinery.