Abstract:
This paper describes ion flotation spectrophotometric determination of trace amount of cadmium ion in water modified simplex method (MSM) of multifactor optimization control by means of IBM-PC computer. The optimum condition of determination of cadmium ion can be obtained. An ion flotation spectrophotometric method for determination cadmium ion in water has linearity range 0.00~0.05mg/L, recovery 95%~106%, relative standardd deviation less than 5% and detection limit 0.35
μg/L. The optimum experiment conditions for ion flotation as follow: 0.02% 5-Br-PADAP 11.30mL, 1% SDS 5.60mL, ammoniacal buffer solution 22.5mL, non-aqueous alcohol 1.00mL, nitrogen flow rate 0.035 Lmin, respectively. This method has a good feasibility, reproducibility, precision, accuracy and satisfactory recovery ratio.