Spectroscopic and Thermogravimetric Investigation of Cd(II) Dinonyldithiophosphate: Removal of Cadmium from Aqueous Solutions

Table 2

Determination of removed cadmium from aqueous solutions by dinonyl dithiophosphoric acid. (a) Effect of HDDTP concentration, (b) influence of pH of aqueous phase, (c) influence of contact time, (d) effect of solvents, and (e) effect of salts (: 228.802 nm).

(a) Effect of HDDTP concentration (pH: 3; time: 3 min.; solvent: kerosene)

HDDTP conc. (10^−3 M)	0.5	1.0	2.0	3.0	4.0	5.0
Extraction rate (%) Cd^++	28	60	100	100	100	100

(b) Influence of pH of aqueous phase (HDDTP: 3·10⁻³ M; time: 3 min; solvent: kerosene)

pH of aqueous phase	0.5	1	2	3	4	6
Extraction rate (%) Cd^++	100	100	100	100	100	100

(c) Influence of contact time (HDDTP: 3·10⁻³ M; pH: 3; solvent: kerosene)

Time (Min.)	1	2	3	4	5
Extraction rate (%) Cd^++	100	100	100	100	100

(d) Effect of solvents (HDDTP: 3·10⁻³ M; pH: 3; time: 3 min)

Solvents	Kerosene	Benzene	-Hexane	Petroleum ether	Carbon-tetrachloride
Extraction rate (%) Cd^++	100	100	100	100	100

(e) Effect of salts (HDDTP: 3·10⁻³ M; pH: 3; time: 3 min; solvent: kerosene)

Salts (0.1 M)	NaClO4	NaCl	NaBr	NaNO3	CH3COONa
Extraction rate (%) Cd^++	100	100	100	100	0.0