Spectrophotometric determination of aniline by the diazotization-coupling method with N-(1-naphthyl)ethylenediamine as the coupling agent

“…The total aqueous Fe concentration was determined using flame atomic absorption spectrophotometry. The concentration of nitrobenzene was measured using the reduction azo-photometry [25], and the amount of aniline in the samples was determined using the N -(1-Naphthalene)-Ethylenediamine ( N -(1-naphthalenyl)-1,2-ethanediamine; N -na; C 10 H 7 NHCH 2 CH 2 NH 2 ) method according to previous research [28]. …”

Section: Methodsmentioning

confidence: 99%

Treatment of Actual Chemical Wastewater by a Heterogeneous Fenton Process Using Natural Pyrite

Sun

2015

IJERPH

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Wastewater from chemical plants has remarkable antibiotic effects on the microorganisms in traditional biological treatment processes. An enhanced Fenton system catalyzed by natural pyrite was developed to degrade this kind of wastewater. Approximately 30% chemical oxygen demand (COD) was removed within 120 min when 50 mmol/L H2O2 and 10 g/L natural pyrite were used at initial pH from 1.8 to 7. A BOD5/COD enhancement efficiency of 210% and an acute biotoxicity removal efficiency of 84% were achieved. The COD removal efficiency was less sensitive to initial pH than was the classic Fenton process. Excessive amounts of pyrite and H2O2 did not negatively affect the pyrite Fenton system. The amount of aniline generated indicated that nitrobenzene reduction by pyrite was promoted using a low initial concentration of H2O2 (<5 mmol/L). Fluorescence excitation emission matrix analyses illustrated that H2O2 facilitated the reduction by natural pyrite of organic molecules containing an electron-withdrawing group to electron-donating group. Thus, the Fenton-like process catalyzed by pyrite can remediate wastewater containing organic pollutants under mild reaction conditions and provide an alternative environmentally friendly method by which to reuse natural pyrite.

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“…Standard sampling protocols were used to collect and preserve groundwater samples in triplicates from a dug-well near a steel industry, Asansol, West Bengal, India, using the grab sampling method (Neilsen and Neilsen 2006). Water samples were preserved in prewashed polypropylene bottles and stored at 4 o C. Aniline and phenol concentrations were determined by UV/Vis Spectrophotometer at the absorbance 555 nm and 500nm respectively for samples before and after the disinfection process (Norwitz and Kellher, 1981;APHA 2017).…”

Section: 1collection and Characterization Of Groundwater Samplesmentioning

confidence: 99%

The competitive effect of Electro-chlorination over chlorination for controlling disinfection by-product formation in phenol and aniline enriched groundwater

Mohanta

Mishra

2021

Preprint

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Disinfection is an essential step to keep humans healthy from microorganisms present in drinking water. However, the formation of disinfection by-products (DBPs) is associated with adverse health effects, and the presence of organic pollutants in groundwater results in even more detrimental effects. Therefore, a better treatment technique is required to disinfect and remove organic pollutants simultaneously to control the formation of DBPs. Electro-chlorination (EC) was carried out using graphite electrode at the current density of 0.54–1.09 mA/cm2 and sodium chloride for in-situ hypochlorite generation to treat groundwater contaminated with phenol and aniline. The comparative study between chlorination and EC showed a significant level of oxidation of phenol and aniline, resulting in their reduction up to 98.48% and 99.47%, respectively, in the EC process. Due to the higher mineralization rate of aniline, both chlorination and EC method are found to be effective. However, only the EC method is found to be appropriate and effective for treating phenol-contaminated water as the chlorination method resulted in the formation of complicated phenolic by-products. Gas-Chromatography/Mass-Spectrometry (GCMS) was used to assess the by-product formation of chlorination and EC in contaminated groundwater through the full-scan.

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Spectrophotometric determination of aniline by the diazotization-coupling method with N-(1-naphthyl)ethylenediamine as the coupling agent

Cited by 45 publications

References 15 publications

Biodegradation of aniline by alkaliphilic strain Bacillus badius D1

Biodegradation of aniline by alkaliphilic strain Bacillus badius D1

Treatment of Actual Chemical Wastewater by a Heterogeneous Fenton Process Using Natural Pyrite

The competitive effect of Electro-chlorination over chlorination for controlling disinfection by-product formation in phenol and aniline enriched groundwater

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