If you feel that your comments have not received a fair hearing you d make your views known to the ASTM Committee on Standards, at the address shown below. A nearly horizontal, straight line should be obtained. Do not attempt to proceed since accurate, quantitative results for the test are not obtainable. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? For example, collect four individual mL samples over the course of a day.
The optimum c depends upon the sample, asttm may include stirring,? If a sample is encountered that exceeds the calibration range, dilute the sample extract to bring the concentration into the calibration range. Cap with the original cap and shake the sample bottle to rinse all interior surfaces. Vent the funnel slowly to prevent loss of sample. If the result is not within these limits, analysis of samples is halted until the problem is corrected, and either all samples in the batch must asym reanalyzed, or the results must be quali?
NOTE 8—The amount of silica gel needed has been estimated d 3 g for every mg of polar material. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Alternatively, solid-phase extraction SPEcontinuous liquid-liquid extraction, or other extraction techniques may be used to prevent emulsion formation.
The amount of acid required will be dependent upon the pH and buffer capacity of the sample at the time of collection. Due to the cost of performing the analysis, each matrix tested contained only one set of Youden pair concentrations. The matrix and chemistry of the solution should be equivalent to the solution used in the collaborative study. Remove the solid with a clean spatula, and add about 1 g of fresh sodium sulfate to the? Do not allow the sample to over? For double-beam operation, either block the light beam from the reference cell containing solvent or remove the reference cell from the instrument during the intervals between scans in order to protect the solvent from unnecessary warming.
Collect an additional 1 or 2 sample aliquots for the matrix spike and matrix spike duplicate Section However, this amount may be insufficient for some samples. D — 04 It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine D Guide for Good Laboratory Practices2 the applicability of regulatory limitations prior to use.
To more accurately calculate the? If the result is not within these limits, analysis of samples is halted until the problem is corrected, and either all samples in the batch must be reanalyzed, or the results must be quali? Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
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