modelling contaminant toxicity lecture 3

Question 1

what are the different forms trace metal can take and how toxic are each

Answer 1

dissovled free ion- most toxic
dissolved metal complexes with ligands- less toxic
metal absorbed to , mineral surface, organic material, minerals- not bioavaliable

Question 2

measured data of species in form

Answer 2

metal total and ligand total

Question 3

how to calculate free copper

Answer 3

assume measured=free
calculate copper complex from equation
recalculate free copper

repeat
profit

Question 4

what type of procedure is that calculatiuon

Answer 4

mas balance

Question 5

draw chart of calculation in model

Answer 5

fine

Question 6

two types of metal removal

Answer 6

precipitation

adsorption

Question 7

draw graph of % metal adsorbed against PH for diffrerent metal s

Answer 7

ok

Question 8

what to check if model is bad

Answer 8

are assumptions correct

is input data correct

Question 9

most common data errors

Answer 9

poor analysis
poor filtration (got more metals)
all potential ligands not included
all adsorbing surfaces not defined