无机酸及饱和的简单(一个羧基)脂肪酸在滴汞电极上不起还原作用。Kovchunov等曾研究了甲酸,乙酸(一元酸)及草酸,柠檬酸等多元酸在0.05M碘化四甲基胺及0.1M Li_2SO_4溶液中的极谱行为,他们指出酸在滴汞电极上由于发生中和H~+电荷而产生一个单波,半波电位在—1.6～—1.8伏间(S.C.E),可测浓度为1～30(毫克分子/升)。S.Fiala及V.Janick曾采用CdSO_4使饱和脂肪酸沉淀,然后测定过剩的Cd~(++)是以间接测定酸。 Inorganic acids and saturated simple (a carboxyl) fatty acids can not afford to reduce the mercury drop electrode. Kovchunov et al. Studied the polarographic behavior of formic acid, acetic acid (monobasic acid) and oxalic acid, citric acid and other polyacids in 0.05 M tetramethyl amine iodide and 0.1 M Li 2 SO 4 solution. They pointed out that the acid Neutralize H ~ + charge to generate a single wave with a half-wave potential of -1.6 to -1.8 volts (SCE) and a measurable concentration of 1 to 30 (millimoles / liter). S. Fiala and V. Janick used CdSO_4 to precipitate saturated fatty acids, and then the excess of Cd ~ (++) was determined by indirect determination of acid.