FIELD: analytical chemistry. SUBSTANCE: square-wave voltameter method involves measurement of volt-ampere level in range of -1.4 -1.8 V (real starch equivalent) using mercury film electrode on silver substrate in background which contains 0.1-0.2 N NaCl and 0.01-0.02 N of ascorbic acid with pH 2.5 - 2.7 and amplitude of rectangular polarizing voltage of 10-30 mV. EFFECT: increased sensitivity and precision. 2 dwg
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