Nitrate-Nitrogen was estimated titrimetrically
using the method of .
On day 7 after the incubation, the glass vial was removed and the C[O.sub.2] trapped in NaOH was then determined titrimetrically
. The qC[O.sub.2] was calculated as the ratio of basal respiration to microbial biomass C and results were expressed as g C[O.sub.2]-C/g [C.sub.MIC]/day.
The concentrations of HC[O.sup.-.sub.3] and [Cl.sup.-] were determined titrimetrically
and mercurimetrically, respectively (Gubachek & Artamoshkina, 1977).
Previous studies have also shown differences in titrimetrically
determined graft levels between untreated PP-g-MA and Soxhlet-extracted copolymer from commercially available copolymer (6).
Lipase activity in the medium was determined titrimetrically
on the basis of olive oil hydrolysis as described by Kempka et al.
Finally, Cl was determined titrimetrically
with AgN[O.sub.3] .
Calcium ([Ca.sup.2+]) and Magnesium ([Mg.sup.2+]) were determined titrimetrically
using standard EDTA.
Alkalinity was determined titrimetrically
with methyl orange indicator, and Cl was determined by titration with silver nitrate.