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<br />PRIORITY OF ISSUES: I. Important 2 - Secondary 3 - Minor 4 - Insignificant <br />MAGNITUDE OF EFFECTS: <br /> <br />Environmental BIOLOGICAL Chemical Industrial <br />Issues <br /> Direct General Soil. Plant- Bioconcen- Game Endangered Detection Effect <br />Issue \ Tal<icity Damage Sediment Soil trati on and Animals Species Methodolog on <br />Fish, to Aquoti c Sludge Movement Brine <br />Rai sing Aquati c prgani sms Sewage Ferti Ii zers Ponds <br />Groups Insects <br />Scientists in <br />Applied Weather 2 I I 3 2 2 I <br />Madi fjcati~n <br />Enviromnental <br />Groups I I 2 I I I 2 <br />Lay Public I 2 2 I I 2 2 <br />Legi slators. <br />Politicians I I 2 2 2 2 2 <br />Regulatory <br />80d; es, EP A, I I 3 2 2 I <br />OSA, SIc'te, <br />Professional <br />I ndu stri al 2 <br />Magnitude <br />of Effects 4 4 3 3 3 3 4 4 <br /> Public Study Research and Bioconcentration, Distribute <br />Recommended Education Transient Transformations. Synergistic <br />Action Monitor and Imposition Effects, Monitoring Information No action <br /> n'ormotion Monitor <br /> <br />( <br /> <br />Figure 7.-Issue sensitivity matrix for silver. <br /> <br />current evidence suggests the effect is insignificant. The possibility that sewage treatment may <br />concentrate silver should be recognized. <br />Although seeding agents can have little effect at the concentrations at which they are applied, <br />concentration by biological or physical means (transformation into more toxic or available <br />forms) or synergistic interaction with other metals might potentiate adverse effects. These <br />possible adverse effects merit further examination. <br />Plants vary in their capacity to accumulate silver but do not show toxic effects at <br />concentrations found in nature. Accumulator species, if identified in a seeding area, might be <br />useful for monitoring animal and human food chains although, as noted earlier, direct toxicity <br />does not appear to be a real threat. Laymen and environmentalists have shown more concern <br />than plant scientists. <br />Despite intensive research, no effect of seeding agents has been found on fish; domestic <br />animals, game animals, or endangered species, and no detriment to them is likely. Public concern <br />now appears to be unjustified. <br />Although the methodology of silver analysis is adequate for detecting its presence in very small <br />concentrations, methods for identifying the chemical compounds in which it occurs are lacking. <br /> <br />~. <br /> <br />? <br /> <br />14 <br />