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已有的Cr(VI)离子电极线性区间下限多数是10~(-3)或10~(-4)M。丰达明等在氟化物底液中获得较佳检测下限(5×10~(-7)M)及线性区间(4×10~(-4)～2×10~(-6)M)。本文用作者新近合成的十六烷基三苯基鏻(HTPP)制备PVC膜Cr(VI)离子电极,检测下限可达8×10~(-7)M,且线性区间明显增宽为6×10~(-2)～2×10~(-6)M。实验部分 1.试剂和仪器:HTPP由本实验室合成。用硫酸调节0.1M氟化铵到pH3.2,溶解
The lower limit of the linear range of the existing Cr (VI) ion electrode is 10 -3 or 10 -4 M. Fengda Ming et al. Obtained the lower limit of detection (5 × 10 -7 M) and the linear range (4 × 10 -4 -2 × 10 -6 M) in the fluoride bottom solution. In this paper, the newly synthesized hexadecyltriphenylphosphonium hexafluorophosphate (HTPP) was used to prepare PVC membrane Cr (VI) ion electrode. The detection limit was up to 8 × 10 ~ (-7) M, and the linear range was significantly expanded to 6 × 10 ~ (-2) ~ 2 × 10 ~ (-6) M. Experimental Section 1. Reagents and Instruments: HTPP synthesized by our laboratory. Adjust 0.1 M ammonium fluoride to pH 3.2 with sulfuric acid and dissolve