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采用线性扫描极谱法和循环伏安法研究布洛芬的电化学行为。在pH 2.79B-R缓冲溶液中布洛芬于-1.298 V(vs.SCE)处产生一灵敏的吸附波,在布洛芬质量浓度为10.0～1 000.0 mg·L~(-1)范围内,其一次微分线性扫描峰电流与布洛芬浓度呈线性关系,检出限(3S/N)为5 mg·L~(-1)。对100.0 mg·L~(-1)布洛芬溶液进行6次平行测定,相对标准偏差为1.62%,回收率在96.2%～103.8%之间。试验证实,布洛芬在电极上的还原反应在低扫速时为受扩散控制的不可逆过程,而在高扫速下,还原波是有吸附性的准可逆波。
The electrochemical behavior of ibuprofen was studied by linear sweep polarography and cyclic voltammetry. In pH 2.79BR buffer solution, ibuprofen produced a sensitive adsorption wave at -1.298 V (vs.SCE), and its ibuprofen mass concentration ranged from 10.0 to 1 000.0 mg · L -1 The linear differential scanning peak current was linear with the concentration of ibuprofen. The detection limit (3S / N) was 5 mg · L -1. The parallel determination of 100.0 mg · L -1 ibuprofen solution was carried out six times with the relative standard deviation of 1.62% and the recoveries between 96.2% and 103.8%. The experiment confirmed that the reduction reaction of ibuprofen at the electrode was an irreversible process controlled by diffusion at low sweep speed, whereas the reduction wave was an adsorptive quasi-reversible wave at high sweep rate.