d_pretreatment_dp

CODE DESCRIPTION FROM_YEAR TO_YEAR
0.00 No information 1984  
1.00 No pretreatment 1984  
8.20 Hydrolysis with K2S2O8 + H3BO3 + NaOH 1984  
8.30 Persulfate digestion (K2S2O8 + H2SO4) 1984  
8.40 Persulfate digestion (K2S2O8 + NaOH) 1984  
8.70 Other deposition pretreatment (please specify per email) 1984