Wednesday, June 24, 2009

Analisis penentuan Non-ionic Surfactants dengan elektrode NIO

Perhitungan :
Potentiometer = 751 GPD Titrino / Titroprocessor
Electrode = 6.0507.010 NIO surfactant electrode; input 1
6.0726.100 Ag/AgCl double junction reference electrode
(inner electrolyte c(KCl) = 3 mol/L, outer electrolyte
c(NaCl) = 1 mol/L)

Pereaksi :
c(STPB) = 0.01 mol/L; D0
STPB = sodium tetraphenylborate

Sampel :
5 mL sample solution
3 mL c(BaCl2) = 0.1 mol/L
60 mL dist. water

Rangkuman :
Titrating agent:
Dissolve 3.4223 g sodium tetraphenylborate in 300 mL dist. water. Dissolve separately 10 g polyvinyl alcohol in 300 mL dist. water and heat it slightly. Allow to cool and rinse both solutions in a 1000 mL flask. Add 10 mL buffer pH = 10 and fill up to 1 liter.

BaCl2 solution:
Dissolve 21 g BaCl2 or 25 g BaCl2*2H2O in dist. water, add 1 mL
conc. HCl and fill up to 1 liter.
Buffer pH = 10:
Dissolve 1.24 g H3BO4 in dist. water, add 10 mL c(NaOH) = 1 mol/L and fill up to 100 mL.

Preparasi Sampel :
Dissolve app. 0.5 ... 1 g detergent (Renex 650 ICI; polyoxyethylene-(30)-nonylphenol, molecular mass 1541 g/mol) in 100 mL dist. water.

Perhitungan:

Nonionic=EP1*C01*C02/C00;4;meq/g

Nonionic = concentration of nonionic Tensides in meq/g
C01 = concentration of titrating agent (0.01 mol/L)
C02 = dilution factor for the sample solution, aliquot (20)

Nonionic = 8.795 x 0.01 x 20 / 0.5145 = 3.4189 meq/g

EP1 = 8.795 mL
C00 = 0.5145 g

Literatur :
Metrohm Application Bulletin No. 230: Titrimetric/potentiometric determination of non-ionic tensides (oxyethylates) with the NIO electrode

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