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ARSENIC DETECTIONS IN GROUNDWATER AT C&D FACILITIES. FDEP CCA TAG GW Subcommittee Steve Clarke, Chair - WM. Arsenic in Florida. How Does Arsenic Get in C&D Groundwater. Naturally Occurring? Releases from CCA Wood? Release from Pesticides? Mobilization of Naturally Occurring Minerals?

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arsenic detections in groundwater at c d facilities

ARSENIC DETECTIONS IN GROUNDWATERAT C&D FACILITIES

FDEP CCA TAG GW Subcommittee

Steve Clarke, Chair - WM

how does arsenic get in c d groundwater
How Does Arsenic Get in C&D Groundwater
  • Naturally Occurring?
  • Releases from CCA Wood?
  • Release from Pesticides?
  • Mobilization of Naturally Occurring Minerals?
  • Other?
slide4

MOBILIZATION PROCESSES

GROUNDWATER REDUCTION

IRON MINERAL

DISSOLUTION

ARSENIC VREDUCTION

As(V)

As(III)

As(V)

GROUNDWATER OXIDATION

FeAsS + 4O2 SO42- + As + Fe

DISPLACEMENT BY OTHER ANIONS

+ (H2AsO4)-

+ (H2PO4)-

(H2AsO4)-

EXAMPLES:

Oxygen removed by decay

Low DO Water  Fe, As

FeAsS in dredge sediments

deposit on banks, oxidize  As

Pesticides: As adsorbs to clays 

Fertilizers: P replaces As  As

LEGEND

Soil mineral with positively charged surface sites

+

As(III)

Arsenite

As(V)

Arsenate

Reaction/process

REVISION: 0

PLOT DATE: 12/10/03

DRAWN BY: ED

slide5

MAJOR ARSENIC

MOBILIZATION PROCESSES

MAJOR ARSENIC

IMMOBILIZATION PROCESSES

GROUNDWATER OXIDATION

AND RESORPTION

GROUNDWATER REDUCTION

IRON MINERAL

DISSOLUTION

ARSENIC VREDUCTION

As(V)(H2AsO4)-

+

+

As(V)(H2AsO4)-

+

As(V)

As(III)

As(V)

As(V)(H2AsO4)-

Iron Oxides

PRECIPITATION

GROUNDWATER OXIDATION

2As(III) + 3S As2S3(Orpiment)

As(III) + S AsS (Realgar)

FeAsS + 4O2 SO42- + As + Fe

DISPLACEMENT BY OTHER ANIONS

+ (H2AsO4)-

+ (H2PO4)-

(H2AsO4)-

LEGEND

Soil mineral with positively charged surface sites

+

As(III)

Arsenite

As(V)

Arsenate

Reaction/process

questions to the tag
Questions to the TAG
  • How do we show that Arsenic is from
    • A release due to CCA Wood?
    • Mobilization of Naturally Occurring Minerals?
    • A Naturally Occurring/Other Source
  • Other?
moving forward
Moving Forward
  • Reevaluate As against select indicators
    • iron, sulfate, TDS, chlorides, turbidity, D.O., others?);
  • Categorize the types of detections; and
  • Consider next steps
    • Confirming the source (sampling); and
    • Evaluating the significance/extent (e.g. modeling?).