Uesful link: https://pdfs.semanticscholar.org/4940/c83417f0d67546173b84ec876925292d0ef9.pdf
Well,
Orpiment is a deep-colored, orange-yellow arsenic sulfide mineral with formula As2S3. It is found in volcanic fumaroles, low-temperature hydrothermal veins, and hot springs and is formed both by sublimation and as a byproduct of the decay of another arsenic mineral, realgar. Orpiment takes its name from the Latin auripigmentum because of its deep-yellow color.
Regards
Arsenic mainly come in groundwater by Water interaction with Arsenic rich Rock -Mineral-Soil, During this Disintegration, dissociation and dissolution processes mainly involved.
I completely agree Dr. Fare F. Fares. If you kindly explain about natural and Anthropogenic sources I would be grateful to you. Thanking you Sir,
Sincerely,
Sudip Saha
It's entirely possible that arsenic affects the metabolism of plants but you have to first think about the chemical species of arsenic that the plant is taking up. If it is indeed taking it up from groundwater, which tends to be low in oxygen, it will be taking up the reduced and highly mobile form As(III). That seems unlikely given that the root area of plants gives off oxygen due to photosynthesis. In all likelihood, the plant is then taking some inorganic and organically-complexed forms of As(V), which tends to carry a charge when dissociated.
This is what allows arsenic to execute its mode of toxicity. One of the characteristic aspects of arsenic's mode of toxicity is the ability of this metal to mimic phosphate. This means that it can potentially affect the uptake of an essential nutrient for the plant creating an indirect effect. Moreover, it also means that arsenic can directly attack DNA (which is why it is generally considered to be a carcinogenic metal). Other than that, the fact that arsenic is an anion may also result in the inhibition of other metalloid compounds like selenium which play an important role in plant metabolism. The redox state of arsenic also means it could potentially disrupt photosynthetic electron transport through the denaturation of proteins and/or by affecting the redox poise of the plant electron transport chain. This could lead to oxidative stress in the plant wherein reactive oxygen species cannot be effectively detoxified and it will be important to distinguish between arsenic directly affecting metabolism and these downstream indirect effects that stem from altering photosynthetic redox metabolism.
I hope you found this helpful and I would be happy to further discuss the potential impacts of arsenic toxicity. I would also refer you to my colleague Martin Pothier who is an expert on the subject for further information.
All the best,
Daniel
Kindly go through the following RG links and PDF attachment.
Article Sources of Arsenic in Groundwater and its health significanc...
Article Arsenic Contamination of Groundwater: A Review of Sources, P...
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