Effect of tetraalkylammonium salt on the retention of metal chelates in reversed phase-high performance liquid chromatography

Miura, Jun′ichiro

doi:10.1007/bf00324983

Cited by 13 publications

(15 citation statements)

References 9 publications

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“…TMA seemed to act not only as a silanol-blocking agent but also as an ion-exclusion agent. 30 TMA gave the best chromatogram of DBHB chelates among the tetra(C 1 -C 5alkyl)ammmonium bromides examined.…”

Section: Hplc Studiesmentioning

confidence: 97%

Separation and determination of scandium by reversed-phase high-performance liquid chromatography with diacetyl-N,N-bis(4-hydroxybenzoylhydrazone) as a pre-column chelating agent

Uehara¹,

Tanaka²,

Shijo³

1998

Analyst

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Section: Hplc Studiesmentioning

confidence: 97%

Separation and determination of scandium by reversed-phase high-performance liquid chromatography with diacetyl-N,N-bis(4-hydroxybenzoylhydrazone) as a pre-column chelating agent

Uehara¹,

Tanaka²,

Shijo³

1998

Analyst

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Section: Determination Of Total Iron In Water Samples 141mentioning

confidence: 99%

“…[18] This is due to the preferential adsorption of TBA þ on the support by the hydrophobic interaction and ion exchange process. [18] As a result, the cobalt(III) chelate cation was excluded from the stationary phase, which was mostly covered by the TBA þ cation. The addition of TBABr to the mobile phase is beneficial to maintain the analytical column and to prolong the lifetime of it, because the strong retention of the cobalt(III) chelate on the column was prevented.…”

Section: Determination Of Total Iron In Water Samples 141mentioning

confidence: 99%

Highly Selective Determination of Total Iron in Environmental Water Samples by HPLC

Miura

Zhang

Nagaosa

et al. 2006

Journal of Liquid Chromatography & Related Technologies

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A simple and selective high performance liquid chromatographic method has been developed for the determination of total iron in water samples. 2-(8-quinolylazo)-4,5-diphenylimidazole (QAI) was used as a precolumn chelating reagent for iron(II). The iron(II)-QAI chelate was separated on a Cosmosil 5C8-MS column with an aqueous acetonitrile mobile phase containing tetrabutylammonium bromide and spectrophotometrically detected at 710 nm. Iron(III) was determined as the iron(II) chelate with QAI after it was reduced to iron(II) using ascorbic acid. Detection limit, defined as three times of standard deviation of a blank signal, was 18 pg of iron(II) in 100 mL injection. Total iron in environmental water samples was selectively determined without any pretreatment.

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“…The last group of methods are superior because of their high sensitivity, but only a few systems have been reported so far: La III -F 2 -Alizarin Complexone, 5 Al III -F 2 -Xylenol Orange, 6 Zr IV -F 2 -Xylenol Orange 7 and Zr IV -F 2 -Semi-Xylenol Orange. 4 Although these methods can achieve very high sensitivities, e.g., in one method 4 a detection limit (DL), of 4.8 ng ml 21 was obtained, their main disadvantage is poor selectivity, which makes them laborious (preliminary separation is usually necessary).…”

mentioning

confidence: 99%

Sensitive reversed-phase liquid chromatographic determination of fluoride based on its ternary systems with zirconium(IV) or hafnium(IV) and 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol

Oszwałdowski¹,

Lipka²,

Jarosz³

et al. 1998

Analyst

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Optimum conditions for the direct reversed-phase LC determination of fluoride based on the ternary M-(F-)-(5-Br-PADAP) complexes [M = ZrIV or HfIV and 5-Br-PADAP = 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol] were evaluated. Chromatographic separation was performed with C18 end-capped column with an eluent consisting of acetonitrile-water (85 + 15 v/v) mixture of pH 4.0 +/- 0.3 (flow rate 1 ml min-1), and the eluate was monitored spectrophotometrically at lambda max = 585 nm. The calibration curves were linear over a wide range of fluoride concentrations: from 1 to 110 and 150 ng ml-1 for the ZrIV-(F-)-(5-Br-PADAP) and HfIV-(F-)-(5-Br-PADAP) systems, respectively (using a 20 microliters loop). Under such conditions the detection limits were 0.8 and 0.7 ng ml-1, respectively, and the quantification limit is 1.0 ng ml-1 for both methods. When a 100 microliters loop was used, the limits of both detection and quantification in the method based on the zirconium system were 0.2 ng ml-1. Using the proposed method, fluoride was determined directly in tap water, saliva and an anti-cancer agent for prostatic cancer (Leuprolid).

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Effect of tetraalkylammonium salt on the retention of metal chelates in reversed phase-high performance liquid chromatography

Cited by 13 publications

References 9 publications

Separation and determination of scandium by reversed-phase high-performance liquid chromatography with diacetyl-N,N-bis(4-hydroxybenzoylhydrazone) as a pre-column chelating agent

Separation and determination of scandium by reversed-phase high-performance liquid chromatography with diacetyl-N,N-bis(4-hydroxybenzoylhydrazone) as a pre-column chelating agent

Highly Selective Determination of Total Iron in Environmental Water Samples by HPLC

Sensitive reversed-phase liquid chromatographic determination of fluoride based on its ternary systems with zirconium(IV) or hafnium(IV) and 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol

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