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基于酚和吡啶可以分别与Cu~(2+)和水杨酸生成稳定的三元络合物,酚或吡啶的存在会抑制铜离子在玻炭电极上还原富集,使铜的微分溶出峰电流i_p′减小,根据溶出峰电流的减水值Δi_p,可以间接测定酚和吡啶。工作电极为玻炭电极,预电解电位为-0.9V(vs.SCE),铜的微分溶出峰值电位为-0.25V(vs.SCE)。本文对测定条件,干扰及其消除方法进行了研究。测得酚的下限为4×10~(12)mol/L,而吡啶的下限为1×10~(-11)mol/L,提出了一个灵敏,准确、简便的测定地面水和空气中痕量酚和吡啶的方法。
Based on phenol and pyridine, respectively, with Cu ~ (2+) and salicylic acid to generate stable ternary complexes, the presence of phenol or pyridine will inhibit the reduction of copper ions in the glass electrode enrichment, the differential dissolution of copper peak Current i_p ’decreases, and phenol and pyridine can be measured indirectly based on the water-reducing value Δi_p of the dissolution peak current. The working electrode is a glassy carbon electrode with a pre-electrolysis potential of -0.9V (vs.SCE) and a differential elution peak potential of copper of -0.25V (vs.SCE). In this paper, the determination of conditions, interference and elimination methods were studied. The lower limit of phenol was 4 × 10 ~ (12) mol / L and the lower limit of pyridine was 1 × 10 ~ (-11) mol / L. A sensitive, accurate and simple method for determination of traces of surface water and air was proposed Phenol and pyridine method.