Amperometric Determination Of Potassium And Of Urease Activity In Plant Materials

Determination of potassium and urease activity of locally found plant seeds have been made.rnThe membrane-stabilized water-nitrobenzene interface was used as an al11pcrometric sensor.rnThe electroanalytical teclmiques employed were cyclic voItammetry, ac-voltanullelly andrnclu·onoamperomelly.rnThe sensor was calibrated by the standard addition method. The detection of 0.025 mmol 1"rnof potassium ion as well as ammonium ion was possible. Since the sodium ion content of thernseed powders investigated was extremely low, no interference of sodium ion was observed.rnSeveral plant seeds have been screened for urease activity. The transfer of anullonium ionrnproduced by enzymatic hydrolysis of urea was followed by the sensor.rnThree new sources of enzyme urease have been found, namely, Kil (lagena/'ia siceraria),rnBerbera (iv!illitiafemiginea), and Gibto (lupinus a/bus).

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