This method is included in NEMI for informational purposes as it is approved by EPA for regulatory use. Detailed information on this method is not currently. eropoly acid. This is reduced to silicomolybdenum blue that is determined pho- tometrically. The method is analogous to APHA SiO2 D+E, ASTM D, . Find the most up-to-date version of ASTM D at Engineering
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Link to Active This link will always route to the current Active version of the standard. The analyte recoveries for the LCS should fall within the control limits of x 6 3S, where x is the IDP amount and S is the standard deviation of the mean recovery established from Measurements may be made at nm with a spectrophotometer, or to nm with a?
Under the allowances made in 1. Those forms of silica that are molybdate-reactive include dissolved simple silicates, monomeric silica and silicic acid, and an undetermined fraction of polymeric silica.
Standard Test Method for Silica in Water
High blanks, nonlinear calibration curves, and poor reproducibility have been observed with some batches of this compound. In contrast, silica may be added as a treatment chemical in some systems, for example, in corrosion control. Your comments will receive careful consideration at a meeting atsm the responsible technical committee, which you may attend. The residue is weighed before and after volatilization as silicon tetra?
Silica may exist in suspended particles, as a colloid, or in solution.
ASTM D859 – 16
It may be applied to natural waters and wastewaters following filtration or dilution, or both. If non-detects are expected in all the samples to be analyzed, a Matrix Spike Duplicate should wstm run instead.
Historical Version s – view previous versions of standard. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Reagents and Materials NOTE 3—Store all reagents to be used in this test method in polyethylene or other suitable plastic bottles. For seawater or brines, this test method v859 applicable only if matched matrix standards f859 standard addition techniques are employed.
The MS should be prepared in accordance with Guide D 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.
The CVS is a solution of the method analyte of known concentration mid-calibration range used to fortify reagent water. Each operator made six determinations at each level, for a total of 72 determinations at each level. Astmm type and composition of the silica-containing minerals in contact with the water and the pH of the water are the primary factors controlling both the solubility and the form of silica in the resulting solution.
ASTM D – 16 – Standard Test Method for Silica in Water
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part adtm the standard. For measurements at nm, plot absorbance versus milligrams SiO2 per litre. Precision and Bias 5 No other units of measurement are included in this standard. A direct reading spectrophotometer or? Refer to Appendix X1 for historical information. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense. This can be compensated for by preparing standards in a zstm similar to that of samples or by using a standard additions technique.
ASTM D – 10 Standard Test Method for Silica in Water
Due to the complexity of silica chemistry, the form of silica measured is defined by the analytical method as molybdate-reactive silica. Mix well and d85 to stand for 10 min. Unless otherwise indicated, it is intended that all reagents shall conform to the speci? Silicon is the most abundant element in igneous rocks and is the characteristic element of all important rocks except the carbonates. The level 2 spiking solution used for the precision and bias study is a suitable IDP solution.
Historical Version s – view previous versions of standard Translated Version s: NOTE 4—Batch to batch variations in ammonium molybdate have been found to affect results at low concentrations below 0. It is applicable to most waters, but some waters may require filtration and dilution to remove interferences from color and turbidity.