GSO ASTM D501:2024

ASTM D501:03(2023)

Gulf Standard Current Edition · Approved on 14 October 2024

Standard Test Methods of Sampling and Chemical Analysis of Alkaline Detergents

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GSO ASTM D501:2024 Scope

1.1 These test methods cover procedures for the sampling and chemical analysis of inorganic alkaline detergents.

1.2 The procedures appear in the following order:

	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

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Material Safety Data Sheets are available for reagents and materials. Review them for hazards prior to usage.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.