Wednesday, June 24, 2009

Analisis penentuan EDTA/NTA idi dalam Detergents dengan alat potensiometer (Titrino/Titroprocessor)

Equipment
Potentiometer = 751 GPD Titrino / Titroprocessor
Electrodes = 6.0502.140 Cu2+ sensitive indicator electrode; input 1
6.0726.100 Ag/AgCl double junction reference electrode (KNO3 sat.)

Reagents
c(Cu2+) = 0.01 mol/L; D0

Sample
10 mL sample solution
10 mL buffer pH = 9.6 [c(NH3/NH4NO3) = 1 mol/L]
2 mL c(Na2EDTA) = 0.01 mol/L
30 mL dist. Water

Remarks
Calculations:

EDTA=(EP1-C01)*C02*C03/C00;2;%
NTA=(EP1-C01)*C02*C04/C00;2;%

EDTA = content of EDTA in %
NTA = content of NTA in %
C01 = amount of EDTA/NTA added (2 mL)
C02 = factor for % (100)
C03 = 1 mL c(Cu2+) = 0.01 mol/L = 2.9225 mg EDTA
C04 = 1 mL c(Cu2+) = 0.01 mol/L = 1.9114 mg NTA

Answer

EDTA = (3.004-2.00) x 100 x 2.9225 / 82.63 = 3.55 %
NTA = (3.004-2.00) x 100 x 1.9114 / 82.63 = 2.32 %

EP1 = 3.004 mL
C00 = 82.63 mg

Sample preparation:
Dissolve 0.5 ... 1 g detergent in 50 mL dist. water at 40 °C. Allow solution to cool and add up to 100 mL. Select the appropriate formula. The other may be deleted. Na2EDTA is added to get a greater break. Treat the amount of Na2EDTA added like a blank value.

Literature
Metrohm Application Bulletin No. 143: Potentiometric determination of nitrilotriacetic acid (NTA) and/or ethylenediaminetetracetic acid (EDTA) in detergents.

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