ASTM D7126-06
Historical Standard: ASTM D7126-06 Standard Test Method for On-Line Colorimetric Measurement of Silica
SUPERSEDED (see Active link, below)
ASTM D7126
1. Scope
1.1 This test method covers the on-line determination of soluble silica in water by colorimetric analysis using the molybdenum blue method, also known as the heteropoly blue method.
1.2 This test method is applicable for silica determination in water with silica concentrations within 0.5 - 5000 ppb (g/L).
1.3 This test method covers the determination of soluble silica SiO 2 (silicon dioxide) or silicates in water. Soluble silica compounds are considered molybdate reactive silica. This test method does not cover the determination of colloidal or polymeric silica, which is considered non-molybdate reactive silica.
1.4 This test method does not cover the laboratory or grab sample measurement of silica in water. Refer to Test Method D 859.
1.5 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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D859 Test Method for Silica in Water
D1066 Practice for Sampling Steam
D1129 Terminology Relating to Water
D1193 Specification for Reagent Water
D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
D3370 Practices for Sampling Water from Closed Conduits
D3864 Guide for Continual On-Line Monitoring Systems for Water Analysis
D5540 Practice for Flow Control and Temperature Control for On-Line Water Sampling and Analysis
Keywords
colorimetric; on-line; process measurement; silica; Measurement processes/systems; Molybdenum; Silica; Calorimeter; Water analysis; Water sampling ;
ICS Code
ICS Number Code 13.060.50 (Examination of water for chemical substances)
DOI: 10.1520/D7126-06
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