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 - 94  Total P₂O₅:   Preferred Method 95 - 97   Alternative Method  98 - 101   pH Titration 102 - 107  Quantitative Separation and Measurement of Various Phosphates:   Reverse-Flow Ion-Exchange Chromatography (Preferred    Method)   108 - 119   Paper Chromatographic Method 120 - 127  pH of 1 percent Solution 128  Turbidity 129  Temperature Rise 130 - 134  Sulfate 135 - 137  Ignition Loss 140 and 141  Matter Insoluble in Water 142 - 144  Particle Size 145  Orthophosphate 146 - 151