Laserfiche WebLink
<br />1lloO....... <br /> <br />. .. <br />..' <br />'* <br /> <br />.. <br /> <br />Table +. Ecological l\spects of PrincipalliVeather Hcx1ification Nucleating Agents. <br /> <br />( Agent Classes and Examples <br /> <br />lianogenous <br />Nucleus <br />CX>z, N 2 , <br />02' Air* <br /> <br />Hygroscopic <br />materials <br />NaCl, NH4N03, <br />UREA, Csnent** <br /> <br />Heterogenous <br />Nucleus <br />.Ag, Pb*** <br /> <br />Organic <br />materials**** <br /> <br /><XNCER.'l <br /> <br />Direct effects <br />toxic as usEd <br />corrosive <br />affects extractive <br />processes <br /> <br />sane <br /> <br />yes <br />probably <br /> <br />probably <br /> <br />Concentrating processes <br />physical processes <br />biological processes <br />biodegradability <br /> <br />Availability to organisms <br />without mCrlification <br />with modification <br /> <br />.' <br /> <br />yes <br />unimportant <br /> <br />yes <br />possibly <br /> <br />possibly <br />possibly <br />important <br /> <br />yes <br /> <br />slight <br />slight <br /> <br />yes <br />yes <br /> <br />Synergistic effects <br /> <br />(. -..;fe.c~ on organisms <br />microbes <br /> <br />few <br /> <br />possibly <br /> <br />possibly <br /> <br />aquatics algae and <br />invertebr~tes <br />fish . <br />plants <br />roam:oals <br /> <br />at very high at very high at high con- <br />concentration concentration centration <br />II II II <br />II II II <br /> \ <br />II II II <br />II II " <br /> <br />*Solid or liquid gases will have no ill effects unless they are contaminated with amino- <br />type conpounds. <br />**lIygroscopic agents would have ill effects only if used in larger arrounts (as in airport <br />clearing) or if concentrated physically as by leaching to concentration basins (i.e. <br />potholes or saline seep areas) . <br />*.l\.*Ueavy metals \~"Ould have effects only if used in amounts necessary to significantly affect <br />background levels. As these levels might be reached, one could becane increasingly <br />concerned about synergistic interactions, concentrating mechanisms, and transforrrations. <br />'u'**Concerns which should be noted. are effects of metaldehyde (?) on people handling it and <br />b;tcterial agents which might be plant pathCXJens. <br />- no major effects or not known <br /> <br />c <br />