Chemical state in lakes and rivers Jari Pasanen

Chemical state in lakes and rivers Jari Pasanen 30. 10. 2021

Chemical state in classification EU priority substances National priority substances observed concentration/EQS Chemical state: ’good’ or ’not-good’ Ecological state maximum ’moderate’ if observed > EQS Other substances Included in ecological classification through their biological impacts EQS: environmental quality standard 2

EU priority substances § European Union wide environmental quality standard values for 33 substances. Alachlor Anthracene Atrazine Benzene Brominated diphenyletheriv Cadmium and its compounds Chloroalkanes. C 10 -13 iv Chlorfenvinphos Chlorpyrifos 1. 2 -Dichloroethane Dichloromethane Di(2 -ethylhexyl)phthalate (DEHP) Diuron Endosulfan Fluoranthenevi Hexachlorobenzene Hexachlorobutadiene Hexachlorocyclohexane Isoproturon Lead and its compounds Mercury and its compounds Naphthalene Nickel and its compounds Nonylphenols Octylphenols Pentachlorobenzene Pentachlorophenol Polyaromatic hydrocarbons Simazine Tributyltin compounds Trichlorobenzenes Trichloromethane (chloroform) Trifluralin 3

EU priority substances observed concentration/EQS Chemical state: ’good’ or ’not-good’ § § § Observed annual average concentration is compared with the environmental quality standard value. For soluble metals local background concentration is taken into account. If any substance exceeds the EQS concentration. the water is classified chemically ’not -good’. 4

EU priority substances § § § Measured in concentrations (μg/l) in water sample. Metals are measured in soluble concentrations. Annual average results are used for AA-EQS Three substances are measured in perch, wet weight (ww) mg/kg. – Mercury (Hb) EQS: 0. 020 (+ background)= 0, 22 -0, 25 mg/kg § Earlier 1, 0 mg/kg (pike) and 0, 5 mg/kg for other fishes – Hexachlorobenzene EQS: 0. 010 mg/kg – Hexachlorobutadiene EQS: 0. 055 mg/kg Also interesting – Nickel and its compounds 20 µg/l 5

Perch § § § Nordic map shows the site-specific arithmetic means of observed mercury concentrations (mg/kg ww), collected in 1985 -2002 Nordic mean for perch is 0, 4 mg/kg (ww) Source: Mercury in Nordic ecosystems, 2007, Norden IVL report B 1761 6

Mercury in perch in Finland § § These results are used in the classification on the second round Under EQS Over EQS Only exceeding in Lapland is artificial lake Porttipahta 7

National priority substances § § National environmental quality standard values for 15 substances. All expressed as concentrations in water sample (μg/l). – Separate standard value for surface waters and water in domestic use. Chlorobenzene 1. 2 -dichlorobenzene 1. 4 -dichlorobenzene Benzyl butyl phthalate (BBP) 2 Dibutyl phthalate (DBP) Resorcinol (1. 3 -benzenediol) (benzothiazol-2 -ylthio) methylithio cyanate Benzothiazole-2 -thiol Bronopol (2 -bromo-2 -nitropropane-1. 3 -diol) Dimethoate MCPA (4 -chloro-2 -methylphenoxy acetic acid) Metamitron Prochloraz Ethylene thiourea Tribenuron-methyl 8

National limit values § § Observed annual average concentration is compared with the environmental quality standard value. If any substance exceeds the EQS concentration -> ecological state is at most ’moderate’ high good moderate poor bad National priority substances observed concentration/EQS if observed > EQS, ecological state maximum ’moderate’ 9

Loading inventory of priority and harmful substances § § § Work is coordinated by Finnish Environment Institute -> report concerning priority substances load and emissions in water district areas Regional authorities give feedback from their point of view (local participation) – Installations (Ni, Hg, Cd, Pb, cooling waters) – Mines (Ni) – Municipal waste water treatment plants (no priority substance emissions) – Municipal waste landfills (no priority substance emissions) – Air deposit (Hg) 10

Point source emissionin Lapland for the inventory 11