Determination of nitrites and nitrates in drinking water using capillary electrophoresis
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Eva Martínková
,
Tomáš Křžek
Abstract
This work was concerned with developing an electrophoretic method for rapid determination of nitrites and nitrates in drinking water. The background electrolyte was Tris-HCl buffer with an addition of cetyltrimethylammonium chloride to reverse the electro-osmotic flow. Online preconcentration of samples using the field-amplified sample stacking method provided detection limits of 0.003 mg L−1 (i.e. 65 nM) for nitrites and 0.010 mg L−1 (i.e. 160 nM) for nitrates, which are sufficiently low for quality control of drinking water. The method was tested in a concentration range corresponding to real drinking water samples and the differentiation between nitrites and nitrates was sufficient for simultaneous determination of nitrites at their concentrations of the order of tenths of mg L−1 and nitrates at their concentrations of the order of units to tens of mg L−1. A number of authors have neglected this important aspect when concentrating only on achieving the lowest possible detection limits. Separation of the two analytes and iodate as an internal standard was achieved in only three minutes. Total analysis time including preconditioning was eight minutes.
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© 2014 Institute of Chemistry, Slovak Academy of Sciences
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Artikel in diesem Heft
- Recent advances in application of liquid-based micro-extraction: A review
- Determination of nitrites and nitrates in drinking water using capillary electrophoresis
- Comparison of digestion methods for determination of total phosphorus in river sediments
- Interdisciplinary study on pottery experimentally impregnated with wine
- Improvement in γ-decalactone production by Yarrowia sp. after genome shuffling
- Development of an effective extraction process for coenzyme Q10 from Artemia
- Effect of anions on the structure and catalytic properties of a La-doped Cu-Mn catalyst in the water-gas shift reaction
- Effect of apple pomace powder addition on farinographic properties of wheat dough and biscuits quality
- Influence of caffeine and temperature on corrosion-resistance of CoCrMo alloy
- Cetyltrimethylammonium bromide- and ethylene glycol-assisted preparation of mono-dispersed indium oxide nanoparticles using hydrothermal method
- Sol-gel synthesis, characterisation, and photocatalytic activity of porous spinel Co3O4 nanosheets
- Solvent-free synthesis of β-enamino ketones and esters catalysed by recyclable iron(III) triflate
- Potassium phthalimide-catalysed one-pot multi-component reaction for efficient synthesis of amino-benzochromenes in aqueous media
- Organocatalytic SOMO reactions of copper(I)-acetylide and alkylindium compounds with aldehydes
- Molecular modelling and quantitative structure-activity relationship studies of anatoxin-a and epibatidine derivatives with affinity to rodent nAChR receptors
- Efficient one-pot synthesis of 2-hydroxyethyl per-O-acetyl glycosides
- Properties of singlet- and triplet-excited states of hemicyanine dyes
