A method for the detn. of sulfate in aq. solns. is based on the pptn. of Pb sulfate, which is then dissolved by an EDTA soln., and spectrophotometric detn. (l = 242 nm) of the Pb-EDTA complex. A H2O-MeOH mixt. is used as the solvent in order to decrease the soly. of the Pb sulfate, and Ba(II) is added to the soln. contg. excess EDTA in order to eliminate the EDTA interference. Sulfate concns. >5 mg/L can be detd. without preconcn. with a relative std. deviation <0.035; the scatter of absorbance measurements around the calibration line corresponds, on the av., to 0.4 mg/L, when 15 mL of sample are taken for anal.
A lead-EDTA spectrophotometric methods for sulphate determination / Magri', Antonio; Santopadre, P.; Tomassetti, Mauro. - In: ANNALI DI CHIMICA. - ISSN 0003-4592. - STAMPA. - 73:(1983), pp. 273-281.
A lead-EDTA spectrophotometric methods for sulphate determination
MAGRI', Antonio;TOMASSETTI, Mauro
1983
Abstract
A method for the detn. of sulfate in aq. solns. is based on the pptn. of Pb sulfate, which is then dissolved by an EDTA soln., and spectrophotometric detn. (l = 242 nm) of the Pb-EDTA complex. A H2O-MeOH mixt. is used as the solvent in order to decrease the soly. of the Pb sulfate, and Ba(II) is added to the soln. contg. excess EDTA in order to eliminate the EDTA interference. Sulfate concns. >5 mg/L can be detd. without preconcn. with a relative std. deviation <0.035; the scatter of absorbance measurements around the calibration line corresponds, on the av., to 0.4 mg/L, when 15 mL of sample are taken for anal.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
