the best method for digestion of plant is adding  (10 ml of concentrated  H2SO4 + 10 ml of H2O2 as catalyst) for 1g plant powder . but for digestion of soil for heavy metals you can to see the  procedures in:Methods of Soil, Plant, and Water Analysis: A manual for the West Asia and North Africa region. Third Edition . Pp133-136 

Dear Husani Mubarak

The various miniral acid are used for digestion of the plant parts and soil if I use ICP-OES instrument for Antimony (III and V) and Arsenic (III and V)

Mineral acid like Hcl,HNO3, H2SO4 & HF etc.

Please find attached herewith  article & link  for  reference

https://www.researchgate.net/post/How_can_spurting_be_reduced_during_digestion_of_soils_using_HNO3_and_perchloric_acid?_tpcectx=profile_answers

H2SO4 for N P elements test

Dear Husani,

The analysis of As is similar to P. U can follow the same procedure what we follow for P to digest the plant samples

the best method for digestion of plant is adding  (10 ml of concentrated  H2SO4 + 10 ml of H2O2 as catalyst) for 1g plant powder . but for digestion of soil for heavy metals you can to see the  procedures in:Methods of Soil, Plant, and Water Analysis: A manual for the West Asia and North Africa region. Third Edition . Pp133-136 

The type acids may be used to dissolve either plant tissues or soils are dependent on the the element to be analysed and and nature materials. If organic substances ar tobe oxidesed any of acids containin high oxygen ratio such as HClO4, H2SO4, HNO3. The ooxidation ability of these acids ordered HClO4> H2SO4> HNO3. If the material cosists of silicate minerals, in this case HF should be used. The mixture of HNO3 and HCl for Au, Pt, Ag, and other precious metals. In the analysis site the ion in the digest should not give complexation reactions. NO3

 Dr.Uygur, compliments for good information.My compliments are also to Mr. Baboo for attaching pertinent literature and link to previous Researchgate discussion on similar subject.

 Thanks all, special compliments for Dear Baboo, Ghafoor and  Uygur , for your valuable suggestions.

I have a lot of article for Total metal or Speciation of antimony and arsenic in the soils and plants analysed with ICP-MS, HG-AFS or HPLC-ICP-MS but not only with ICP-OES. I am going to do Speciation of antimony and arsenic in the soils and plants by ICP-OES. Is there any difference in digestion of sample for total antimony and Sb(III) & Sb(V)?

the best method for digestion of plant is adding  (10 ml of concentrated  H2SO4 + 10 ml of H2O2 as catalyst) for 1g plant powder . but for digestion of soil for heavy metals you can to see the  procedures in:Methods of Soil, Plant, and Water Analysis: A manual for the West Asia and North Africa region. Third Edition . Pp133-136 

Which acid can I use for digestion of plant parts and soil? - ResearchGate. Available from: https://www.researchgate.net/post/Which_acid_can_I_use_for_digestion_of_plant_parts_and_soil#view=56e446e95b4952e8762e547e [accessed Jan 18, 2017].