with hot HCI and then hot reagent water. Filter paper and residue are returned to the digestion flask,
refluxed with additional HCI and then filtered again. The digestate is then diluted to a final volume
of 100 mL.
2.4 If required, a separate sample aliquot shall be dried for a total percent solids
determination.
3.0 INTERFERENCES
3.1 Sludge samples can contain diverse matrix types, each of which may present its own
analytical challenge. Spiked samples and any relevant standard reference material should be
processed in accordance with the quality control requirements given in Sec. 8.0 to aid in determining
whether Method 3050B is applicable to a given waste.
4.0 APPARATUS AND MATERIALS
4.1 Digestion Vessels - 250-mL.
4.2 Vapor recovery device (e.g., ribbed watch glasses, appropriate refluxing device,
appropriate solvent handling system).
4.3 Drying ovens - able to maintain 30'C + 4°C.
4.4 Temperature measurement device capable of measuring to at least 125 0C with
suitable precision and accuracy (e.g., thermometer, IR sensor, thermocouple, thermister, etc.)
4.5 Filter paper - Whatman No. 41 or equivalent.
4.6 Centrifuge and centrifuge tubes.
4.7 Analytical balance - capable of accurate weighings to 0.01 g.
4.8 Heating source - Adjustable and able to maintain a temperature of 90-950 C. (e.g., hot
plate, block digestor, microwave, etc.)
4.9 Funnel or equivalent.
4.10 Graduated cylinder or equivalent volume measuring device.
4.11 Volumetric Flasks - 100-mL.
5.0 REAGENTS
5.1 Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is
intended that all reagents shall conform to the specifications of the Committee on Analytical
Reagents of the American Chemical Society, where such specifications are available. Other grades
may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its
use without lessening the accuracy of the determination. If the purity of a reagent is questionable,
analyze the reagent to determine the level of impurities. The reagent blank must be less than the
MDL in order to be used.
with hot HCI and then hot reagent water. Filter paper and residue are returned to the digestion flask,
refluxed with additional HCI and then filtered again. The digestate is then diluted to a final volume
of 100 mL.
2.4 If required, a separate sample aliquot shall be dried for a total percent solids
determination.
3.0 INTERFERENCES
3.1 Sludge samples can contain diverse matrix types, each of which may present its own
analytical challenge. Spiked samples and any relevant standard reference material should be
processed in accordance with the quality control requirements given in Sec. 8.0 to aid in determining
whether Method 3050B is applicable to a given waste.
4.0 APPARATUS AND MATERIALS
4.1 Digestion Vessels - 250-mL.
4.2 Vapor recovery device (e.g., ribbed watch glasses, appropriate refluxing device,
appropriate solvent handling system).
4.3 Drying ovens - able to maintain 30'C + 4°C.
4.4 Temperature measurement device capable of measuring to at least 125 0C with
suitable precision and accuracy (e.g., thermometer, IR sensor, thermocouple, thermister, etc.)
4.5 Filter paper - Whatman No. 41 or equivalent.
4.6 Centrifuge and centrifuge tubes.
4.7 Analytical balance - capable of accurate weighings to 0.01 g.
4.8 Heating source - Adjustable and able to maintain a temperature of 90-950 C. (e.g., hot
plate, block digestor, microwave, etc.)
4.9 Funnel or equivalent.
4.10 Graduated cylinder or equivalent volume measuring device.
4.11 Volumetric Flasks - 100-mL.
5.0 REAGENTS
5.1 Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is
intended that all reagents shall conform to the specifications of the Committee on Analytical
Reagents of the American Chemical Society, where such specifications are available. Other grades
may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its
use without lessening the accuracy of the determination. If the purity of a reagent is questionable,
analyze the reagent to determine the level of impurities. The reagent blank must be less than the
MDL in order to be used.
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