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sulfate

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sulfate

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									Industriestrasse 25 CH-9471 Buchs E-mail: Flukatec@europe.sial.com Fax: ++41 81 755 2815

Sulfate
Barium ionophore I
(V 163; N,N,N′,N′-Tetracyclohexyl-oxybis(o-phenyleneoxy)diacetamide) C40H56N2O5 Mr = 644.90 [96476-01-6]
N O O O O O N

11788

Selectophore®, function tested

50 mg

Sulfate ionophore I
S H N NH H N S H N

(1,3-[Bis(3-phenylthioureidomethyl)]benzene) C22H22N4S2 Mr = 406.57 [37042-63-0]

17892

Selectophore®, function tested

50 mg, 250 mg

Electrochemical Transduction • Ion-Selective Electrodes

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Industriestrasse 25 CH-9471 Buchs E-mail: Flukatec@europe.sial.com Fax: ++41 81 755 2815

Electrochemical Transduction
Ion-Selective Electrodes
Application 1 and Sensor Type 2Potentiometric determination of SO4 in water with a polymer membrane ion-selective electrode based on .Barium ionophore I applying Gran’s plot titration. Recommended Membrane Composition Barium ionophore I (11788) 1.20 wt% 0.80 wt% Potassium tetrakis(4-chlorophenyl)borate (60591) 64.90 wt% 2-Nitrophenyl octyl ether (73732) 33.10 wt% Poly(vinyl chloride) high molecular weight (81392) Recommended Cell Assembly Reference⏐⏐sample solution⏐⏐liquid membrane⏐0.1 M BaCl2⏐AgCl,Ag Electrode Characteristics and Function Slope of linear regression: 28.6 mV (5•10 – 5•10 M Ba ) 2Detection limit: 50 mg SO4 /L Practical pH measuring range: 4-7 Standard deviation of the slope: 0.2 mV Drift: < 0.25 mV/h Application 2 and Sensor Type 2Assay of SO4 activity with solvent polymeric membrane electrode based on Sulfate ionophore I. Recommended Membrane Composition Sulfate ionophore I (17892) 1.0 wt% 0.7 wt% Tridodecylmethylammonium chloride (TDDMACl) (91661) 65.5 wt% 2-Nitrophenyl octyl ether (73732) 32.8 wt% Poly(vinyl chloride) high molecular weight (81392) Recommended Cell Assembly Reference⏐⏐sample solution⏐⏐liquid membrane⏐0.1 M BaCl2⏐AgCl,Ag Electrode Characteristics and Function Recommended Cell Assembly Reference ⏐⏐ 0.1 M HEPES-NaOH (pH 7.0) ⏐⏐ sample solution ⏐⏐ liquid membrane ⏐ 0.01 M KCl + 0.01 Na2SO4 ⏐ AgCl, Ag Electrode Characteristics and Function Selectivity coefficients logK
3 -5 -3 2+ 1, 2

Pot SO , X 4
2.9

as obtained by the matched potential method (in 0.1 M HEPES-NaOH buffer (pH 7.0)

logK

Pot SO , SCN 4 Pot SO , NO 4 3 Pot SO , NO 4 2 Pot SO , Br 4 Pot

logK

Pot SO , HSO3 4 Pot SO , HCO3 4 Pot SO , Acetate 4 Pot SO , H PO 4 2 4

-0.3

logK

1.6

logK

-0.9

logK

1.1

logK

-1.5

logK

0.6

logK

-1.5

-0.1 SO , Cl 4 -7 -2 Slope of linear regression: -28 mV (7•10 to 2•10 M NaSO4) 2Detection limit: 33 µg SO4 /L Membrane resistance: 50 kΩ
1

logK

O. Lutze, B. Ross. K. Cammann, Gran's plot titration and flow injection titration of sulfate in ground and drinking water with a barium ion-selective electrode, Fresenius J. Anal. Chem. 350, 630 (1994). 2 M.W. Läubli, W. Simon, F. Vögtle, F. Bongardt, T. Kleiner. Barium-selective electrodes based on neutral carriers and their use in the titration of sulfate in combustion products. Anal. Chem. 57, 2756, (1985). 3 S. Nishizawa, P. Bühlmann, K. Xiao, Y. Umezawa, Application of a bis-thiourea ionophore for an anion selective electrode with a remarkable sulfate selectivity, Anal. Chim Acta 358, 35 (1998).

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