A novel kinetic-spectrophotometric method for determination of nitrites in water
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Zenovia Moldovan
Abstract
A simple, selective and sensitive kinetic method for the determination of nitrite in water was developed. The method is based on the catalytic effect of nitrite on the oxidation of methylene blue (MB) with bromate in a sulfuric acid medium. During the oxidation process, absorbance of the reaction mixture decreases with the increasing time, inversely proportional to the nitrite concentration. The reaction rate was monitored spectrophotometrically at λ = 666 nm within 30 s of mixing. Linear calibration graph was obtained in the range of 0.005–0.5 μg mL−1 with a relative standard deviation of 2.09 % for six measurements at 0.5 μg mL−1. The detection limit was found to be 0.0015 μg mL−1. The effect of different factors such as acidity, time, bromate concentration, MB concentration, ionic strength, and order of reactants additions is reported. Interference of the most common foreign ions was also investigated. The optimum experimental conditions were: 0.38 mol L−1 H2SO4, 5 × 10.4 mol L−1 KBrO3, 1.25 × 10.5 mol L−1 MB, 0.3 mol L−1 sodium nitrate, and 25°C. The proposed method was conveniently applied for the determination of nitrite in spiked drinking water samples.
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© 2009 Institute of Chemistry, Slovak Academy of Sciences
Artikel in diesem Heft
- GC-MS analyses of flower ether extracts of Prunus domestica L. and Prunus padus L. (Rosaceae)
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Artikel in diesem Heft
- GC-MS analyses of flower ether extracts of Prunus domestica L. and Prunus padus L. (Rosaceae)
- A novel kinetic-spectrophotometric method for determination of nitrites in water
- Characterization of recombinant antibodies for detection of TNT and its derivatives
- Improvements in the selection of real components forming a substitute mixture for petroleum fractions
- Chemical evaluation of seeded fruit biomass of oil pumpkin (Cucurbita pepo L. var. Styriaca)
- Application of 31P NMR for added polyphosphate determination in pork meat
- Estimation of composition, coordination model, and stability constant of some metal/phosphate complexes using spectral and potentiometric measurements
- Synthesis, characterization, and anti-tumor activities of some transition metal(II) complexes with podophyllic acid hydrazide
- Artificial neural network prediction of steric hindrance parameter of polymers
- Immobilization of porphyrins in poly(hydroxymethylsiloxane)
- Preparation and characterization of porous cordierite for potential use in cellular ceramics
- Characterization of NiFe2O4 nanoparticles synthesized by various methods
- QSAR analysis of 1,3-diaryl-2-propen-1-ones and their indole analogs for designing potent antibacterial agents
- QSAR study of 2,4-disubstituted phenoxyacetic acid derivatives as a CRTh2 receptor antagonists
- Comparison of isothermal and non-isothermal chemiluminescence and differential scanning calorimetry experiments with benzoyl peroxide
- Wettability of plasma-polymerized vinyltriethoxysilane film
- A spectrofluorimetric method for the determination of acitretin in pharmaceuticals
- Fatty acid profile of Trichosanthes kirilowii Maxim. seed oil
- Determination of the enthalpy of fusion of K3TaO2F4 and KTaF6
