The Arctic Environmental Problems - New Ecoinformatics Tools in Environmental Science: Applications and Decision-making - page 548

Table 6.15 Laboratory analytical results of heavy metal concentration in sediments and river-
water measured in July 1996 during the American-Russian hydrophysical expedition (Krapivin
et al. 1998a)
Sample ID# Location As Cd Cr Cu Ni Pb Zn

River sediment samples (ppm)
I4 Bolshaya Rechka 7.2 <0.52 26 19 25 15 <64

I1 Irkutsk, above the dam 5.0 <0.51 41 22 44 11 55

I2 Irkutsk, below the dam 4.5 <0.51 20 11 21 9 17

I3 Below Irkutsk 8.1 <0.52 54 42 60 20 88

A1 Angarsk, technical ditch 0.9 <0.50 7.0 11 9.3 7.9 32

A2 Above Angarsk 4.3 <0.51 48 38 40 14 86

A3 Kitoy River 2.4 <0.50 27 20 37 7.8 40

B1 Bratsk, above the dam 0.5 <0.50 6.4 9 12 2.3 22

B2 Bratsk, below the dam 3.4 <0.50 31 210 39 6.1 50

J1 Angara, below Kulakovo 3.2 <0.50 14 13 18 4.5 32

J3 Below Kazachinskoye 5.8 <0.51 54 43 390 18 150

J4 Strelka, at the junction 5.1 <0.51 47 35 14 100

J5 Below Kazachinskoye 2.2 <0.50 18 8. 37 3.9 47

J6 Below Lesosibirsk 6.9 <0.51 34 31 20 17 100

I2 Irkutsk, below the dam 0.512 <0.50 <10 <20 36 <5.7 120

I3 Below Irkutsk 10 <0.50 <10 <20 <20 <5.7 92

A1 Angarsk 12 <0.50 <10 <20 <20 <5.7 240

B1 Bratsk, above the dam 16 <0.50 <10 <20 <20 <5.7 87

J1 Angara, below Kulakovo 12 <0.50 <10 <20 <20 <5.7 31

J2 Kazachinskoye 8.6 <0.50 <10 <20 <20 <5.7 140

J6 Below Lesosibirsk 13 <0.50 <10 <20 <20 <5.7 92

River water samples (ppb)
I2 Irkutsk, below the dam 12 <0.50 <10 <20 <20 <5.7 120
I3 Below Irkutsk 10 <0.50 <10 <20 <20 <5.7 92
A Angarsk 12 <0.50 <10 <20 <20 <5.7 240
B1 Bratsk, above the dam 16 <0.50 <10 <20 <20 <5.7 87
J1 Angara, below Kulakovo 12 <0.50 <10 <20 <20 <5.7 31
J2 Kazachinskoye 8.6 <0.50 <10 <20 <20 <5.7 140
J6 Below Lesosibirsk 13 <0.50 <10 <20 <20 <5.7 92
Places of sampling are marked in the map in Fig. 6.14 . The measurement error did not exceed one
sigma. Concentration values are given within 1 sigma uncertainty. The sign “ < ” indicates less than
the minimum detectable concentration at the 90 % con dence level

average global background. For samples taken near Bratsk, only background levels
of 137 Cs activity were detected.
The 137 Cs concentrations in samples taken on the undeveloped reaches of the
Angara River upstream of the AYRS junction at Strelka, were determined to be at
low background levels, about 2 Bq/kg of dry river sediment. Downstream from the