We are using digestion mixture -aqua regia (a digestion mixture of Nitric acid, Perchloric acid and sulphuric acid into 5:1:1 ratio) for soil and plant samples digestion. I want more satisfactory and an accurate protocol for estimating Total concentration of heavy metals either from soil or from plants sample.
miss Nayanmoni, please write complete reference or source to find out from literature.
Dear Singh,
The best method is to take a 0.5 g of dry soil for acid digest.
You can combine 2 mL of nitric acid (14,64 M) and 6 mL of hydrochloric acid (12 M) and incubate for 16 h. Then, you can heat your samples on a DigiPREP microwave for about 190 minutes (different heating phases). Filtrate and then complete to 50 ml before quantification on a ICP-AES.
Best regards,
Ramez Saad (Ph.D)
Reference: ISO NF 11464 and 11446
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