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Understanding BAF. BioAccumulation Factors. Understanding BAF. Important to estimate human pollutant exposure from consumption of contaminated food material; Part of the Ambient Water Quality Criteria (AWQC);. BW. AWQC = RfD x RSC. DI + ∑ (FI x BAFi). Understanding BAF. Where:

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understanding baf

UnderstandingBAF

BioAccumulation

Factors

understanding baf1
Understanding BAF
  • Important to estimate human pollutant exposure from consumption of contaminated food material;
  • Part of the Ambient Water Quality Criteria (AWQC);

BW

AWQC = RfD x RSC

DI + ∑ (FI x BAFi)

understanding baf2
Understanding BAF
  • Where:
      • RfD = reference dose for noncancer human health effects
      • RSC = relative source contribution to account for non-water sources of exposure
      • BW = human body weight
      • FI = food intake
      • BAFi = bioaccumulation factor for chemical “i”
method for estimating baf
Method for Estimating BAF
  • Three approaches:
    • Direct
    • Indirect
    • Conversion (modified direct)
direct method
Direct Method
  • Calculated using simple ratio of the chemical concentration in tissue and water.

BAF = Ct / Cw

Where :

Ct = concentration of the chemical in the wet tissue (either whole organism or specified tissue)

Cw = concentration of chemical in water

indirect method
Indirect Method
  • Used if:
    • No such field data
    • Unreliable field data
  • Used for the development of wildlife criteria
  • Estimated by multiplying a BCF by a FCM
formula for fcm
Formula for FCM
  • Factor used yo account for the food chain interaction and biomagnification
  • Example:

FCM TL 2 = (BMF TL2)

FCM TL 3 = (BMF TL2) (BMF TL3)

FCM TL 4 = (BMF TL2) (BMF TL3) (BMF TL4)

FCM = food chain multiplier for designated trophic level (TL2, TL3 or TL4);

BMF = biomagnification factor for designated trophic level (TL2, TL3 or TL4)

formula for bmf
Formula for BMF
  • Basic difference between FCM and BMF
    • FCM : related back to trophic level one;
    • BMF : always related back to next lowest trophic level

(BMF TL2) = (C TL2) / (C TL1)

(BMF TL3) = (C TL3) / (C TL2)

(BMF TL4) = (C TL4) / (C TL3)

conversion method
Conversion Method
  • Used if unavailable concerning data
  • Example total mercury, dissolved total mercury or total methylmercury instead of methylmercury form.
biomaginification of ddt ppm
Biomaginification of DDT (ppm)

Fish-eating birds (0.17 – 2.07)

Fish (0.17 – 2.07)

Mud snail

0.26

Clam

0.42

Insects

0.23 – 0.3

shrimp

0.16

Organic debris

0.3 – 13.0

Cladophore

0.03

Plankton

0.04

Marsh plants

0.33 – 2.8

Sea-water

1 x 10-6

Fresh-water

1 x 10-5

(Preston, 1989)

accumulation value
ACCUMULATION VALUE
  • Terms of Accumulation
    • BAF = Bioaccumulation Factors
    • BCF = Bioconcentration Factors
    • BMF = Biomagnification Factors
    • FCM = Food Chain Multipliers