Potassium thiophosphate

Note Methanolic sodium hydroxide solution can replace potassium hydroxide solution [16] (q.v.). The production of color tones and fluorescence is very dependent on the duration and temperature of heating hence optimal conditions must be determined empirically [16]. Some thiophosphate insecticides do not form fluorescent derivatives [16]. The natural fluorescence of various cumarin derivatives is intensified [1]. 

Tetrabromophthalein ethyl ester potassium salt is a pH indicator that changa from blue to yellow in the pH range 4.2-3. It is known that proteins and alkaloids fordli blue-colored salt-like adsorption compounds with this indicator that are not destroyeti by weak acids [3]. Thiophosphate pesticides and triazines possibly form similar conhi pounds. 

A composition for dissolving filter-cake deposits left by drilling mud in wellbores is composed of an aqueous solution of citric acid and potassium chloride, alkali metal formate, acid tetraphosphate, alkaline earth chloride, and alkali metal thiophosphate [1012]. 

A sample of 0.4863 gram of this purified 0,0-diethyl O-p-nitrophenyl thiophosphate was dissolved in acetone to make 1 liter of standard solution. A 20-ml. aliquot, containing 9.73 mg., was placed in a 100-ml. volumetric flask and 30 ml. of acetone were added. Then 0.35 gram of potassium chloride and 0.6 gram of acetic acid were dissolved in about 25 ml. of water and added to the acetone solution 0.01 g am of gelatin was dissolved in a few milliliters of water by warming, cooled, and added to the above, and the... 

These thiophosphates are hydrolysed in dilute solution with evolution of H2S. They can be dissolved unchanged in alkalies. With salts of the heavy metals they give precipitates which are decomposed on warming, giving H2S. They are easily oxidised by nitric acid, potassium dichromate, etc. with deposition of sulphur. When treated... 

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