ASTM D501-03(2023)

  Sections Caustic Soda:    Sampling 5  Total Alkalinity as Sodium Oxide (Na₂O) 6 - 8  Sodium Hydroxide (NaOH)  9 - 11  Carbonate as Sodium Carbonate (Na₂CO₃) 12  Carbon Dioxide (CO₂) by the Evolution Method 13 - 16 Soda Ash:    Sampling 17  Matter Volatile at 150 °C to 155 °C 18 and 19  Total Alkalinity as Sodium Carbonate (Na₂CO₃ ) 20 - 22  Sodium Bicarbonate (NaHCO₃) 23 - 25  Sodium Bicarbonate (NaHCO₃) by Potentiometric Titration 26 - 28  Matter Insoluble in Water 29 and 30  Apparent Density 31 and 32 Modified Soda (Sequicarbonate Type):    Sampling 33  Total Alkalinity as Sodium Oxide (Na₂O) 34 - 36  Sodium Bicarbonate (NaHCO₃) and Sodium Carbonate (Na₂CO₃) 37 - 39  Matter Insoluble in Water 40 Sodium Bicarbonate:    Sampling 41  Sodium Bicarbonate, Sodium Carbonate, and Free Moisture 42 - 45  Matter Insoluble in Water 46 Sodium Metasilicate, Sodium Sesquisilicate and Sodium Orthosil-   icate:    Sampling 47  Total Alkalinity as Sodium Oxide (Na₂O) 48 - 50  Total Silica as SiO₂ 51 - 53  Sodium Metasilicate (Na₂SiO₃·5H₂O) 54  Sodium Sesquisilicate (3Na₂O·2SiO₂·11H₂O) 55  Matter Insoluble in Water 56 and 57  Loss on Ignition of Sodium Sesquisilicate (3Na₂O·2SiO₂ ·11H₂O) 58 and 59  Sodium Orthosilicate (Na₄SiO₄) 60 Trisodium Phosphate:    Sampling 61  Trisodium Phosphate (Na₃PO₄) Content and Phosphorus   Pentoxide (P₂O₅)  
62 - 64  Trisodium Phosphate Calculated as Na₃PO₄·12H₂O, Na₃PO₄·   H₂O, Na₃PO₄, and as P₂O₅  
65 - 68  Total Alkalinity as Sodium Oxide (Na₂O) 69 - 71  Matter Insoluble in Water 72 and 73 Tetrasodium Pyrophosphate:    Sampling 74  Tetrasodium Pyrophosphate
  (Na₄P₂O₇)  
75 - 79  Matter Insoluble in Water 80 and 81  Loss on Ignition 82 and 83 Borax:    Sampling 84  Total Borate and Excess Alkalinity or Acidity 85 - 87  Matter Insoluble in Water 88 and 89 Sodium Triphosphate:    Sampling 90  Tritratable Na₂O 91 - <