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-.�',� - .a- ... " .r,��;ww,,:rsa, �m r:.,rr.e .€ �:r;: ,�a.r .1,=.. _fir% .":sn .A,'.--^ s -ti l 1 Du Pont MR 399-87 Results The percento of radiolabeled xylene mineralised by soil slurries -1 (M-18779) and HW-19 (M-18773) are listed in Tables 3 and 4, roapectively. Some of the labeled material was detected in both the formaldehyde treated and untreated bottles. This was most likely the result of volatile labeled xylene being adsorbed to the filter. for the first soil slurry (8-1) a change in the evolution of labeled CO2 from the control (formaldehyde treated) was not detected at the letter two time periods (24 and 63 hr). Therefore, the best nutrient combinations were chosen based upon the peak labeled CO2 evolution at 4 hr. The highest response came from the moil slurry treated with 00 ppm phosphate (P), 50 ppm ammonium Chloride (N), and 8.3 ppm trace metals (TH). In order of decreasing mineralization the - following were the treatments in the top 40:: 40 ppm R, 50 ppm N, and TM; ®O ppm P and 50 ppm N; 80 ppm P, 200 ppm N, and TM; Ppand 100 m P and 10Np(medium ppm P and 5D ppm N (lour nutrient treatment), SO ppmppm nutrient treatment); and, 40 ppm P, 200 ppm N, and TM. For the second soil slurry (MW-19), some of the test bottles were different from the control at 24 and 72 hr. Because this was not consistent with all of the treatments, again decisions were made based upon the labeled i CO2 trapped on the filter after 4 hr. The highest response (greatest amount ' of labeled CO2) occurred with the nutrient treatment containing 160 ppm P and 200 ppm N. R e top 40% of the samples from high to low were: 40 ppm P and 100 ppm N; 160 ppm P and 100mppm ��d4Ytlppl60 and P, 200 ppm pandPTH;and and, 200 ppm N; 160 ppm P, 100 pp , pp pp ' . .80 ppm P and 100 ppm W. r The groundwater experiment using NaOH as the trapping agent provided almost a 10-fold drop in the counts collected on the filter paper; hGwever,' the counts did increase over a period of one week. The response was more consistent, i.e., steadily increased and was higher, with the presence of r trace metals caimpared to the bottle not treated with trace acetals. Several significant responses did arise from the lowest concentrations of a and N in the absence of Til. Since this was encouraging from a cost standpoint this treatment (9) was chosen for one of the scale-up vessels. Another treatment which was in the top 40% for both soil slurries was the seedium concentrations of P and N without TM (5). This was the second nutrient treatment used in .the scale-up procedure. Tables 5 and 6 list the ATP concentrations and chemical anelyces for benzene, toluene, and xylene, E respectively. In Table 5 both water and moil slurries were tested for ATF. The water from the vessel treated with loss nutrients demonstrated fluctuating ATP values throughouCthe two weeks. Whereas, the soil slurry showed a incref�se ( steady except whin-tlte substrate-was-exhausted by 615/87)-in- c-- ------ - ATP level. The ATP in the medium nutrient vessel did attain a hfgfre£ Level for the waterond the sail slurry at the end of two weeks than"the low ' nutrient vessel. 6 - .. 5