Potassium hydrogen phosphates decompositions

Noordam et al. reported the separation of pilocarpine, and the decomposition products mentioned above, on an octadecyl column with a mobile phase consisting of a mixture of water and methanol (97 3) containing 5 potassium hydrogen phosphate (pH 2.5)(Fig.14.1). It was found that increasing the salt concentration and lowering the pH lead to improved selectivity and peak shape. 

Heavy metal orthophosphates (M = Cr, Mn, Fe, Co, Ni, Zn, Hg, Pb, Ag) can be prepared in hydrated form by simple double decomposition involving aqueous solutions of an alkali hydrogen phosphate and the appropriate metal salt. Cobalt phosphate octahydrate, for example, is obtainable as a beautiful lavender-coloured precipitate from cobalt chloride and potassium dihydrogen phosphate. 

Nutrients are usuaUy added at concentrations ranging from 0.005 to 0.02% by weight (16). In a field appHcation using hydrogen peroxide, nutrients were added to the injected water at the foUowing concentrations 380 mg/L ammonium chloride 190 mg/L disodium phosphate, and 190 mg/L potassium phosphate, the latter used primarily to complex with iron in the formation to prevent decomposition of hydrogen peroxide (24). 

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