Registration Dossier

Diss Factsheets

Administrative data

Endpoint:
field studies
Type of information:
experimental study
Adequacy of study:
other information
Reliability:
2 (reliable with restrictions)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1998

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: (i) sampling locations should cover the entire lake ; (ii) locations at close proximity of the major drainage discharge points of the lake should be covered ; (iii) locations representative of the average conditions in the lake [...] should be covered
Principles of method if other than guideline:
Water and sediment samples of Dhanmondi Lake were collected from seven sampling locations in order to determine spatial variation of lead concentration.
GLP compliance:
not specified
Type of measurement:
EDTA titrimetric method ; Spectrophotometry ; Atomic Absorption Spectrophotometry ; Modelisation

Test material

Constituent 1
Reference substance name:
PbCO3
IUPAC Name:
PbCO3
Details on test material:
- Name of test material (as cited in study report): PbCO3(aq)

Results and discussion

Any other information on results incl. tables

Average aqueous lead concentrations varied from 151 to 210 µg/L during dry season, and from 30 to 120 µg/L during the wet season while the average lead concentration in the bottom sediment varied from 10.7 to 44.7 mg/Kg dry weight.

Aqueous lead concentration decreased significantly from the dry to the wet season, by almost by a factor or two, primarly due to the dilution effect resulting from increased rainfall and surface runoff. The concentration of lead in the bottom sediment varied significantly among sampling locations, with locations close to inlet points showing higher levels of lead.

Applicant's summary and conclusion

Conclusions:
The average lead concentration in Dhanmondi Lake water exceeds the limiting values set for drinking, fishing, livestock, industrial and irrigation use in the environmental quality standards for Bangladesh.