By W. John Williams
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This can be achieved by diluting the solution with ethanol. 38 Uppström has recommended propionic anhydride catalysed by oxalyl chloride as a means of eliminating water from the sample. This reacts in two ways, or (COCl) 2 + H 20-^2HC1 + CO + co 2 (COCl) 2 + 2 H 2 0 - K C O O H ) 2 + 2HC1 the first reaction predominating in aqueous solution. The reaction between boron and curcumin then takes place in a completely homogeneous liquid medium. Excess of protonated curcumin is destroyed with an ammonium acetate buffer.
It is a liquid-membrane type, the active liquid phase consisting of a quaternary ammonium salt dissolved in an organic solvent. Its response to carbonate is linear over the range 48 General Anions 7 2 10 -10 M . 5. It shows good selectivity over carbonate, chloride, sulphate and phosphate. Furthermore, in the physiologically important pH region hydroxide ions do not interfere. Detailed information on the composition and properties of the active membrane phase are given in the original papers. A successful gas-sensing electrode for C 0 2 has been described by Ross, 43 Riesman and Kruger .
A G A Z Z I , E . J . , Analyt. , 39, 233 (1967) 67. M A E C K , W . J . , K U S S Y , M . E . , GiNTHER, B . E . , W H E E L E R , G . v . and R E I N , J . E . , Analyt. , 35, 62 (1963) 68. P I E R C E , F . D . and B R O W N , H . R . , Analyt. , 48, 670 (1976) 69. D A U G H T R E Y , E . H . and H A R R I S O N , w . w . , Analytica chim. Acta, 67, 253 (1973) 70. M O H A Y , J. and M O H A Y - F A R K A S , J . , Acta, pharm. , 37, 71 (1967); Analyt. , 15, 3567 (1968) 71. M A R I N E N K O , G .