Dear Hamieh Goshtasbi ,

for Sodium Alginate please see the answer(s) of a recent similar question:

https://www.researchgate.net/post/May_I_know_the_ICDD_Card_No_for_Sodium_Alginate_in_XRD_analysis

For chitosan please see the answer of Marcella Bini from May 30 in:

https://www.researchgate.net/post/I_performed_xrd_analysis_of_my_chitosan_sample_can_someone_help_me_interpret_its_diffractogram/1

Best regards

G.M.