BALTIC SEAENVIRONMENT PROCEEDINGS No. 59 - Helcom

Table 2. Obligatory and tentative determinands in BMP.
Physical and chemical determinands in sea water.
Oblisatorv: T, S, Op, PO,, P-tot, No3, NO;!, SiO,'(l), PI-I(~),
alkalinity (2).
(1) = obligatory only in Kattegat, the Sound and the Belt Sea.
(2) = only in connection with 14C primary production measurements.
Tentative: density, N-tot.
Remarks: Only those methods which have been succesfully
intercalibrated have been accepted for the analyses of obligatory
determinands.
Heavy metals, petroleum hydrocarbons and chlorinated hydrocarbons
in sea water.
Tentative: Hg, Cd, Zn, Cu, Pb, Sn-tot, Sn-org., PHCs, DDTs, PCBs I
lindane.
Remarks: Heavy metals and chlorinated hydrocarbons are included in
the BMP for the Third Stage as tentative determinands because of
the methodological problems concerned.
Harmful substances in biota.
Obliqatorv species: Herring, cod.
Tentative species: Macoma baltica, Mytilus edulis (Bivalvia);
Saduria (Mesidothea) entomon (Crustacea).
Obliqatorv substances: pp'-DDT, pp'-DDE, pp'-DDD, PCBs, HCB, cr-
HCH, -HCH, Hg, Cd, Pb.
Tentative determinands: Chlordanes, dieldrines, Zn, Cu.
Remarks: Herring and cod are used as indicator organisms due to a
number of reasons:
- they are caught in all parts of the Baltic
- they are of suitable size
- their biology is fairly well known
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