184
T. Sch6ndorf et al.
2.2.2
Hel-Extractable Mercury
Following the extraction with 0.07 N hydrochloric acid according to DIN EN 71,
Part 3, mercury is determined by means of CV AAS.
2.2.3
Soil Treatment with Digestive Model Juices
Digestive juices are complex mixtures of enzymes, lipids and electrolytes varying
in their composition in dependence on nutriments offered.
For the investigation of mercury compounds mobilized from soil samples, an
optimized formulation of digestive model juices (Table 1) containing mainly
natural compounds as mucin, pepsin, pancreatin and lyophilized bile was used
(Rotard et al. 1995).
Table 1. Formulation for digestive model juices
Inorganic components (mg!l)
Organic components (mg/l)
Saliva
KCI
895
Urea
200
KSCN
200
Uric acid
15
NaH2PO,
885
C(-Amylase
145
Na2S0,
570
Mucin, porcine
50
NaCI
290
Gastric juice
NaCI
2750
Glucose
650
NaH1P04
270
Glucoronic acid
20
KCI
820
Urea
85
CaCll
200
Pepsin
1000
NH4 CI
305
Serum albumin, bovine
1000
HCI
1380
Mucin, porcine
18 000
Glucosamine hydrochloride
330
Duodenum juice
NaCl
7010
Urea
100
NaHCOJ
1800
Serum albumin, bovine
1000
Na1CO,
1000
Pancreatin, porcine
18000
KH1P04
80
Lipase, porcine
500
KCI
560
MgCIl
50
CaCll
200
Bile Juice
NaCI
5250
Bile, porcine, freeze-dried
36000
NaHCOJ
4200
Serum albumin, bovine
1800
Na1CO,
1000
Urea
250
KCI
370
CaCI2
220