Is it just the water soluble and exchangeable fractions or also the complexed/adsorbed/chelated fractions?
Also, is it good to determine the dynamic fractions of Arsenic by DTPA?
Please look at the following below links which may help you in your analysis:
https://www.agriculturejournals.cz/publicFiles/53925.pdf
https://link.springer.com/article/10.1007%2Fs11356-019-04833-8
https://www.ncbi.nlm.nih.gov/pubmed/25544651
Thanks
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