The linear relationship between the peak current and Norfloxacin concentration was found in the range of 4.0×10-9~4.0×10-7mol·L-1 with correlation coefficient of 0.996.The detection limit was found to be 1.0×10-9mol·L-1(S/N=3) with acummulation for 110 s.
The detection limit of the method is 0.2 μg/L ClO2 and the linear range is 0.3-180 μg/L. The method is highly selective, simple, sensitive and has been applied to the determination of ClO2 in tap water. The results are satisfactory.
The linear range of the calibration curve,the apparent molar absorptivity and the detection limit for CR-CPB system at 510 nm were 0-4.16×10-5 mol·L-1,1.62×104 L/(mol·cm),and 9.78×10-7 mol·L-1 respectively;
The detection limit and the correlation coefficient of the calibration curve were 0.64 μg /L and 0.999 9,respectively. The RSD was 2.6% and the recovery range was 95%-101%. The method is easy to operate and time-saving.
On the optimized conditions, the detection limits were 0.0273 μg/L for arsenic and 0.0034 μg/L for mercury. The RSD was 1.09%-3.34%(n=7). Arsenic and mercury recoveries were 96.59%-103.97% and 96.78%-98.95% respectively.
The linear range of this analysis method was between 4ng/ml to 48ng/ml,the correlation coefficient(r) of standard curve was 0.9998.The detection limits of Chromium(Ⅲ) and(Ⅳ) were 0.8ng/ml and 0.7ng/ml respectively.
In 0.05 mol/L phosphate buffer(pH 6.0) and by differential pulse voltammetric mode,there was an excellent linearity between oxidation current and concentration of p-benzenediol in the range of 1×10-4-6×10-6 mol/L with a detection limit of 4.0×10-7 mol/L.
Sensitivity and reproducibility of the methods were compared. The method using C18 column in selected ion monitoring (SIM) mode had a detection limit (S/N=3) of 120 pg, and a good linearity of the calibration curve was obtained for tetrodotoxin (r=0.9992).