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Knisely ret poster_ Knisely ret poster_ Presentation Transcript

  • Drinking  water  &  Lead  Contamina2on   Kari  Knisely1,  Aus2n  Atkins2,  Jeff  Cunningham3   1.  Sligh  Middle  School;  2.  Department  of  Civil  &  Environmental  Engineering,  University  of  South  Florida  3.  Department  of  Civil  &  Environmental  Engineering,  University  of  South  Florida   Abstract   Approach   Conclusions  In  Madagascar  only  47%  of  the  popula+on  has  access  to  clean  drinking  water.  In  the  Eastern  part  of  the  island,  local  ar+sans  dig  shallow   3  Methods  tested   Aker  researching  the  different  methods  displayed  in  drinking  water  wells  and  install  locally  manufactured  pumps.  Lead   1.  Atomic  Absorp+on  Spectroscopy  (AAS)   the  table,  the  ASV  has  proven  to  be  consistent  in  its  from  old  ba5eries  is  used  for  various  parts  of  these  pump  systems  as   2.  Anodic  Stripping  Voltammetry  (ASV)   results  while  the  Colorimetry  methods  have  been  very  floats  and  as  solder  on  the  screen  in  contact  with  the  water.   3.  Field  Kit  -­‐  Colorimeter   inconsistent.      Preliminary  sampling  of  wells  in  2010  and  analysis  for  lead  using  ICP-­‐  MS  at  the  University  of  South  Florida  (USF)  indicated  that  there  were  some  wells  with  lead  levels  above  safe  limits  of  10  ug/L  as  set  by  the   7  Concentra+on  Levels  made  to  be  tested   The  Anodic  Stripping  Voltammetry  (ASV),  clearly  is  the  World  Health  Organiza+on.  Through  the  Master’s  Interna+onal   •  1  mg/L   best  and  most  reliable  method  for  accurate  readings  of  program  in  Civil  and  Environmental  Engineering  at  USF,  our  team   •  150  μg/L   lead  contamina+ons  less  than  100  μg/L.    It  is  unclear  at  currently  has  a  member  on  the  ground  in  Madagascar  who  wishes  to   •  100  μg/L   this  +me,  what  method  is  most  accurate  and  test  these  levels  in  the  field.  This  research  compared  the  effec+veness   •  50  μg/L   recommended  for  concentra+on  levels  over  100  μg/L,  of  different  analy+cal  methods  to  measure  the  level  of  lead   •  10  μg/L   but  will  con+nue  to  be  researched.    The  ASV  is  contamina+on  in  drinking  water.    The  mobile/portable  analy+cal  methods  include  Anodic  Stripping  Voltammetry  (ASV)  and  Colorimetry   •  5  μg/L   lightweight,  easy  to  use,  and  does  not  require  with  various  reagents  for  color  development.  Analysis  via  lab  based   •  1  μg/L   electricity  as  well  as  fairly  accurate  when  used  to  test  methods  like  the  Graphite  Furnace  Atomic  Absorp+on  Spectroscopy   the  lead  levels  in  the  standards.       Results    (GFAAS)  were  used  to  compare  with  the  field  based  kits.  The  results  from  this  work  will  be  used  to  iden+fy  the  most  suitable  method  of   At  this  +me,  it  will  be  recommended  that  USF  select  analysis  for  field  measurements  of  lead  in  drinking  water  in   the  ASV  as  the  measurement  method  to  be  used  in  the  Madagascar.   u  The  AA  requires  electricity,  gas,  and  is  not  a  mobile  method     field  in  Madagascar  to  measure  the  lead  concentra+on   u  The  ASV  was  extremely  self  explanatory,  accurate,  the  fastest   Background   method,  lightweight  and  mobile  requiring  4  AA  ba5eries   levels  in  the  drinking  water  supplies.   While  traveling  to  Madagascar,  USF  iden+fied  a  major   u  The  Colorimeter  was  not  consistent  in  its  readings,  the  chemical   health  risk  for  the  residents  of  the  under  developed   tes+ng  process  was  extremely  complicated  and  +me  consuming,  but   third  world  country.  The  most  common  source   was  very  lightweight  and  mobile  requiring  ba5eries.       currently  used  in  most  villages  to  retrieve  drinking     water  is  being  made  out  of  melted  lead.    The   assump+on  is  that  the  level  of  lead  found  in  their   drinking  water  pumped  from  these  units  contain  an   The  table  below  demonstrates  the  readings  each  method  displayed  each   5me  it  was  tested.    The  closer  to  the  standard  the  more  accurate  the  test.   References   unhealthy  concentra+on  of  lead  posing  even  more   Standard     Method  1     Method  2   Method  3   Method  3   u  All  photos  taken  from  google  images  or  personal   serious  health  risks  to  the  country  already  struggling   Levels   AA   ASV   Field  Kit-­‐  Colorimeter   Field  Kit  –  Colorimeter   camera   to  survive  many  water  borne  illnesses.    USF  is  seeking   w/  HACH  Chemicals     w/  Leadquick  Chemicals   to  iden+fy  which  method  would  be  most  efficient  yet   1  mg/L   TBA   Not  in  range   Not  a5empted   Not  aWempted     effec+ve  to  use  in  the  field  where  electricity  is  usually   not  available.   150  μg/L   TBA   Not  in  range   123   100,  55,  75   100  μg/L     TBA   95   Not  a5empted   63,  55,  43  Objec2ve   50  μg/L   10  μg/L   TBA   TBA   44,  42,  49,  44   7,  3   30   Not  a5empted   34,  29,  32   <3,  <3,  <3  To  compare  results  given  by  3  different  methods  on  the  7  different  lead  concentra+on  levels  in  drinking  water  and  conclude  which  method  is   5  μg/L   TBA   6,  5   Not  a5empted   <3,  <3,  <3  most  effec+ve  to  be  used  in  the  field  in  Madagascar.   2  μg/L   TBA   14,  20   Not  a5empted   Not  aWempted   0  μg/L   TBA   48,  14   Not  a5empted   <3,  <3,  <3   For  more  informa+on  about  the  program  visit:  h5p://wareret.net.    The  Water  Awareness  Research  and  Educa+on  (WARE)  Research  Experience  for  Teachers  (RET)  is  funded  by  the  Na+onal  Science  Founda+on  under  award  number  1200682.