Amperometric titration of calcium, strontium and barium and their mixtures in presence of large amounts of alkali metal salts

Wojciechowski, Marek; Rubel, S.; Falkowska, W.

doi:10.1016/s0003-2670(01)95346-2

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…A preferable approach, in the interest of simplicity, would be to eliminate altogether the purging process. The possibility of avoiding the removal of oxygen has been demonstrated by using current-sampled dc, pulse, and ac polarography (6), complexometric titration with fixed potential square-wave polarographic detection of the end point (7,8), differential pulse anodic stripping voltammetry (9), and subtractive anodic stripping voltammetry (10). In each case, the presence of oxygen raises the detection limit of the technique as a result of the high uncertainties in the background current due to fluctuations in the concentration of dissolved oxygen.…”

Section: Literature Citedmentioning

confidence: 99%

Square-wave anodic stripping analysis in the presence of dissolved oxygen

Wojclechowski¹,

Go²,

Osteryoung³

1985

Anal. Chem.

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Substantial reductionIn analysis time has been achieved in anodic stripping analysis by eliminating the necessity lor oxygen removal. This was made possible by using square-wave voltammetry as a stripping technique in a low-pH electrolyte (0.1 M HCI04). Electroreduction of oxygen In acidic medium does not affect either the precision or the sensitivity of the method. Linear calibration plots were obtained for a model system at submicromolar concentration levels (0.1-1.3 µ Cd(II)) using short deposition times (5-240 s) at -0.7 V vs. SCE.

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Section: Literature Citedmentioning

confidence: 99%

Square-wave anodic stripping analysis in the presence of dissolved oxygen

Wojclechowski¹,

Go²,

Osteryoung³

1985

Anal. Chem.

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“…A study of rotating disk electrodes for EDTA amperometric titrimetry has shown that the Pb02 on titanium support electrode is the most efficient (94). In the square-wave titration of calcium, strontium, and barium with triethylenetetraaminehexaacetic acid and lead as indicator ion, the end point corresponds to the total alkaline earth concentration (256). With iodine as photoredox indicator, calcium, zinc, and bismuth have been amperometrically titrated with 1,2-diaminocyclohexanetetraacetic acid (CDTA) (224).…”

Section: Precipitation and Complexingmentioning

confidence: 99%

Amperometric, bipotentiometric, and coulometric titration

Stock¹

1984

Anal. Chem.

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This survey covers the period from the previous review (229) through Oct 1983. The order of treatment is the same as in that review. Unless otherwise specified, potentials are with respect to the saturated calomel electrode (SCE).Reviews of amperometric methods include drug analysis (120), the monitoring of the composition of alloys (177), and the determination of the platinum metals ( 56). An examination of the effect of the rate of amperometric titration on the position of the equivalence point has led to the conclusion that this rate can be increased without a marked decrease in accuracy (41). Other reviews concern oscillopolarographic (69,

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“…When the bound mineral is calcium, the phytase activity can be estimated by the freed calcium concentration. There are a number of methods for analyzing free calcium (Ca 2+ ) in solutions, such as titrimetry (Wojciechowski et al, 1982), inductively coupled plasma-atomic emission spectrometry (ICP-AES) (Miller-Ihli and Baker, 2001), and indirect potentiometry (Bedlechowicz et al, 2005). In particular, ion-selective electrode (ISE) potentiometry offers several significant advantages over other techniques in the field.…”

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confidence: 99%