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| http://dx.doi.org/10.1021/acs.est.5b01226 | DOI Listing |
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Colorimetric Determination of Dissolved Oxygen: Assessment of Methodological Influences on Iodine Spectra, Isosbestic Point, Precision and Accuracy.
ACS Omega
November 2024
Institute of Oceanography, National Taiwan University, 1 Section 4 Roosevelt Road, Taipei 106319, Taiwan.
The colorimetric method for determining dissolved oxygen concentrations in freshwater and seawater samples essentially relies on measuring the absorbance of released I and I in a mixed form. While this approach is relatively quick and convenient, it is susceptible to significant temperature effects during analysis, irrespective of field temperatures. Additionally, the influences of spectrophotometric absorbance wavelengths and iodine concentrations on oxygen concentration determinations are ambiguous.
View Article and Find Full Text PDFMiniaturized dual-wavelength β-correction spectrophotometric probe for sensitive detection of cyanide in water via formation of cyano dithizone adduct.
Spectrochim Acta A Mol Biomol Spectrosc
February 2025
Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia; Chemistry Department, Faculty of Science, Damietta University, New Damietta, Damietta, Egypt. Electronic address:
Article Synopsis
- Cyanide in water poses serious health and environmental risks, prompting the creation of a low-cost, sensitive probe for detection using direct dual wave β-correction spectrophotometry.
- The probe uses the reaction between cyanide ions and dithizone at pH 6.8-7.2 to create a red adduct, which can be accurately measured at a specific wavelength (480 nm) for precise detection.
- The method shows improved detection limits and reproducibility compared to conventional techniques, validating its effectiveness in real water samples with a high recovery rate of 99.2%.
A New Activity Assay Method for Diamine Oxidase Based on Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry.
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October 2024
Department of Biochemistry, Faculty of Science, Palacký University, Šlechtitelů 27, CZ-779 00 Olomouc, Czech Republic.
Copper-containing diamine oxidases are ubiquitous enzymes that participate in many important biological processes. These processes include the regulation of cell growth and division, programmed cell death, and responses to environmental stressors. Natural substrates include, for example, putrescine, spermidine, and histamine.
View Article and Find Full Text PDFAnalysis of binary mixture of oxytetracycline and bromohexine in their combined veterinary formulation by four simple spectrophotometric methods with greenness assessment.
BMC Chem
October 2024
Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmed Hegazy St, Beni-Suef, 62514, Egypt.
Article Synopsis
- - Tetracyclines, specifically oxytetracycline (OTC), are key antibiotics used in food animals, and combining them with bromhexine (BR) enhances their antibacterial effects while also serving as a mucolytic agent.
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Determination of ammonium and nitrate in soils by digital colorimetry.
Environ Monit Assess
September 2024
Chemistry Department, Lomonosov Moscow State University, Leninskie Gory 1 Build. 3, Moscow, Russian Federation, 119991.
A method of digital colorimetric determination of ammonium and nitrate in soils is proposed. The method is based on corresponding photometric procedures of ammonium and nitrate determination after potassium chloride extraction from soil samples. Ammonium is determined as an indophenol dye, and nitrate is determined as an azo dye.
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