Inorganic, radioisotopic and organic analysis of 241-AP-101 tank waste

Abstract

*Elevationis the distancefromthe tmskbottomto the mouth of the samplebottle. The entire contents of each sample container were transfemed to a 1-L jaq the net mass transferred was calculated by difference from the fill and empty container masses.b The 860-g (659.8-mL) AP-1 01 composite was sealed and stirred for 54 minutes using a magnetic stir bar. A 10l-mL subsample was transferred to a glass bottle and sealed. For subsequent precipitatiordcrystallization testing at reduced temperature. Portions of the remaining composite material were used for subsequent analyses. The composite sample did not show signs of phase separation or precipitation. The overall sample processing is summarized in Figure 2.1. 2.2 Sample Digestion for Analysis After sample homogenization, the AP-101 composite sub-samples were delivered directly to the laboratories for various measurements including mercury, cyanide, hydroxide, tritium, total organic carbon, total inorganic carbon, ammoni~ion chromatography (inorganic and organic ions), 14C, pertechnetate, 79Se,and gamma spectrometry. The AP-101 composite density (see Table 3.5) was determined in the Shielded Analytical Laboratory (SAL). The SAL processed 5-mL aliquots in triplicate according to PNL-ALO-128, HNOS-HC1Acid Extraction of Liquids for Metals Analysis Using a Dry-Block Heater, for subsequent ICP and ICP/MS analyses. The acid extracted solutions were brought to a nominal 25-mL volume and absolute volumes determined based on final solution weights and densities. This acid digestion resulted in a solution with a small amount of white floating particulate. The floating particulate were removed by filtration. The filtrates were analyzed by ICP and ICP/MS. Along with the samples, the SAL processed a reagent blank, a toxicity characteristic leach protocol (TCLP)-metals spiked blank, and TCLP-metals spiked sample. The TCLP metals spike included Ag,

Strontium/strontium‐90 removal from c helate‐bearing Hanford tank waste using crystalline silicotitanate

“…These chelators include N ‐(2‐hydroxyethyl) ethylenediaminetriacetic acid (HEDTA), ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), citrate, and gluconate as well as their degradation products 23–25 . The concentration of strontium has been found ×500 higher in these chelate‐bearing liquid wastes (e.g., 47 mCi 90 Sr per L from tank AN‐102) than the non‐chelated waste (e.g., 0.087 mCi 90 Sr per L from tank AP‐101) 26,27 . Similar trends apply to transuranics 28 .…”