Water Everywhere – But Is it Safe to Drink?

Poulos, A.

doi:10.1007/978-3-030-80338-4_7

Cited by 2 publications

(1 citation statement)

References 91 publications

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“…[44][45] Many international jurisdictions have set aesthetic manganese guidelines for drinking waters at 50 ppb of Mn 2 + . [46][47][48] The US EPA has also established a Secondary Maximum Contaminant Level (SMCL) of 50 ppb in finished water as an objective to limit aesthetic problems, [49] and Health Canada has set a maximum acceptable concentration in drinking water of 100 ppb for human health and 20 ppb for aesthetics. [50] Among all existing oxidative states, the divalent form (Mn 2 + ) predominates in most water at pH 4-7, but the higher oxidation species may occur at higher pH values.…”

Section: Introductionmentioning

confidence: 99%

Manganese Detection in Water Samples via Photometrix Colorimetric Analysis on Smartphones, by using Silver Nanoparticles Prepared from Okara Extract

Panjina,

Rawat,

Seedad

et al. 2024

ChemistrySelect

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Soybean residue (okara) extract combined with trisodium citrate was applied as reducing and stabilizing agents for the green synthesis of silver nanoparticles (AgNPs). Okara contained large quantities of biomolecules affecting the property of the synthesized AgNPs as a detection sensor. This work presented the application of the AgNPs as a colorimetric probe for Mn2+ detection. A free mobile application called PhotoMetrix that can be downloaded onto smartphones was developed for a color analysis. The developed approach provided a linearity range for Mn2+ detection of 0.025–5.0 ppm with the limit of detection and limit of quantification of 0.01 and 0.03 ppm, respectively, under optimal conditions. The reaction time was 9 minutes with no need for pH adjustment. The developed method was applied for Mn2+ determination in filtered water samples, and the results were in good agreement with the standard method, atomic absorption spectroscopy. The binding sites of interaction between molecular functional groups surrounding the surface of AgNPs and Mn2+ ions were characterized to elucidate the detection selectivity, and it was found that carbonyl and hydroxyl groups were key to the sensor activity.

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Section: Introductionmentioning

confidence: 99%