Diammonium phosphate

We need to buy 50 tons daiammonium phosphate 99% for foods grade as follow :
use for food industry
technically pure white crystalline powder
formula (nh4)2hpo4
mol.wt 132.06
p2o5 content min.53 % by wt.
n content min. 21 % by wt.
arsenie (as) max 0.00005%
iron (fe) max 0.002%
lead (pb) max 0.002%