Proposals for Acute and Chronic Quality Standards

Chemical risk assessments are carried out by comparing environmental concentrations with the associated quality standards. If the environmental concentration exceeds the quality standard, a risk for aquatic organisms can be assumed. A comparison of the environmental concentration and the acute quality standard (MAC-EQS= maximum allowable concentration) may be helpful for assessing the likelihood of possible damage to the organisms within the next 24 to 96 hours. Chronic quality standards (AA-EQS = annual average concentration) are recommended for water quality monitoring. They can be used for assessing pollution over an extended time period. For the continuous input of micropollutants from treated effluents, the chronic quality standard is particularly relevant and helps to protect the organisms against the consequences of long-term pollution.

The majority of the quality criteria will be updated by the end of 2016 for addition to Annex 2 of the Water Protection Ordinance as numerical requirements for water quality. Updated values are continuously added to the table below (a: values for substance already updated; za: values for substance will be updated soon). The derivation of these values can be followed using the associated substance data sheets. Up-to-date substance data sheets can be obtained upon request at the Ecotox Centre.

Substance CAS Number Acute quality standard 
(MAC-EQS) µg/l
Chronic quality standard
(AA-EQS) µg/l
Pharmaceuticals and steroidal estrogens      
17-alpha-Ethinylestradiol 57-63-6 not proposed 3.7*10-5
17-beta-Estradiol 50-28-2 not proposed 4.0*10-4
Atenolola 29122-68-7 330 150
Azithromycina 83905-01-5 0.18 0.019(*)
Bezafibratea 41859-67-0 4000 2.3(*)
Carbamazepinea 298-46-4 2000 2
Ciprofloxacin 85721-33-1 0.363 0.089
Clarithromycina 81103-11-9 0.19 0.12(*)
Diatrizoate (3,5-diacetamido-
2,4,6-triiodobenzoic acid)
117-96-4 at present not possible at present not possible
Diclofenaca  15307-86-5,
(15307-79-6)
not proposed  0.05(*)
Erythromycin 114-07-8 2.3 0.04 
Estron  53-16-7  not proposed 3.6*10-3 
Ibuprofena 15687-27-1,
(31121-93-4)
1710 0.011(*) 
Iomeprol 78649-41-9 at present not possible at present not possible
Iopamidol 60166-93-0 at present not possible at present not possible
Iopromide 73334-07-3 at present not possible at present not possible
Irbesartan 138402-11-6 19100 704
Mefenamic acida 61-68-7 at present not possible 1(*)
Metformina 657-24-9 640 156
Metoprolola 37350-58-6 75 8.6
Naproxena 22204-53-1;
(26159-34-2)
860 1.7(*)
Propranolol 4199-09-1 12 0.16
Sotalola 3930-20-9 at present not possible at present not possible
Sulfamethazinea 57-68-1 30# 30#
Sulfamethoxazolea 723-46-6 2.7 0.6
Trimethoprima 738-70-5 214 120
Valsartan 137862-53-4 9000 560
Transformation products of pharmaceuticals      
10,11–Dihydro-10,11-
Dihydroxy-
Carbamazepine
58955-93-4 at present not possible 100
Carbamazepin 10,11-epoxide 36507-30-9 at present not possible at present not possible
14-Hydroxy-Clarithromycin 110671-78-8 0.135 0.085
N-Desmethyl-Clarithromycin 101666-68-6 1.5 1.5
Guanylurea 141-83-3 at present not possible at present not possible
Pesticides      
Azoxystrobina 131860-33-8  0.55 0.2
Bentazona 25057-89-0 470 270
Bentazon-N-Methyl 61592-45-8 860 23
Boscalida 188425-85-6  11.6#  11.6#
Carbendazima 10605-21-7 0.7 0.44
Chloridazona 1698-60-8 190 10
Chlorpyrifos 2921-88-2 derivation in progress derivation in progress
Chlortolurona 15545-48-9 2.4 0.6
Cypermethrina 52315-07-8 4.4*10-4 3*10-5
Cyproconazola 94361-06-5 1.25# 1.25#
Cyprodinila 121552-61-2 3.3# 0.33#
2,4-D 94-75-7 1.3 0.2
Diethyltoluamid (DEET)a 134-62-3 410 88
Diazinona 333-41-5 0.02# 0.012#
Dicambaa 1918-00-9 52 2.2
Dimethoatea 60-51-5 0.977 0.07
Diurona 330-54-1 0.25 0.07
Epoxiconazola 135319-73-2
(stereoisomers:
106325-08-0)

0.24

 0.2
Ethofumesatea 26225-79-6 260 3.1
Glyphosatea 1071-83-6 360 120
Imidacloprida 138261-41-3 0.1 0.013
Iprovalicarba 140923-17-7 190# 190#
Irgarol (Cybutryn) 28159-98-0 0.013 0.0023
Isoproturona 34123-59-6 1.7 0.64
Linurona 330-55-2 1.37 0.26
MCPAa 94-74-6 6.4 0.66
Mecoprop-Pa 16484-77-8 187 3.6
Metalaxyl-Ma 70630-17-0 98# 98#
Metamitrona 41394-05-2 39 4.0
Metazachlora 67129-08-2 0.28 0.02
Methoxyfenozidea 161050-58-4 3.7 0.36
Metribuzina 21087-64-9

0.87

0.058
Napropamida 15299-99-7 6.8 5.1
Nicosulfurona 111991-09-4 0.085 0.0087
Pirimicarba 23103-98-2 1.8 0.09
Propamocarba 25606-41-1 1030# 1030#
Pyrimethanila 53112-28-0 32 1.5
S-Metolachlora 87392-12-9
(S-isomer)
3.3 0.69
Tebuconazolea 107534-96-3 1.4 0.24
Terbuthylazinea 5915-41-3 1.28 0.22
Terbutryna 886-50-0 0.34 0.065
Thiacloprida 111988-49-9 0.08 0.01
Thiametoxama 153719-23-4 1.4 0.042
Triclosana 3380-34-5 0.02# 0.02#
Transformation products of pesticides      
AMPA 1066-51-9 1500# 1500#
Chloridazon-desphenyla 6339-19-1 at present not possible 250
Chloridazon-methyl-desphenyl 17254-80-7 3700 37
Industrial chemicals      
Benzothiazol 95-16-9 246 238
Benzotriazola 95-14-7;
(273-02-9)
158 19
Bisphenol A (BPA)a 80-05-7 53 0.24
Bromate 15541-45-4 50 50
Methylbenzotriazola 29878-31-7;
29385-43-1
(64665-57-2)
425 20
Nonylphenola 25154-52-3;
84852-15-3
3.8 0.043
Perfluoroktansulfonat (PFOS) 1763-23-1 36 0.23(*) (based on direct aquatic long-term toxicity)
biota EQS = 9.1 µg/kg
Complexing agents      
EDTA 60-00-4 12100 2200
NTA 139-13-9,
(5064-31-3)
9800 190

 

*Substances for which there may be a secondary intoxication risk that has not been numerically considered to date.

#For some substances, the chronical (AA-EQS) and the acute quality criteria (MAC-EQS) are identical. This can be the case if the acute and chronic toxicity are not so different. Then, if a larger assessment factor is used for the calculation of the MAC-EQS than for the calculation of the AA-EQS (100 instead of 10), the MAC-EQS would be lower than the AA-EQS. In this case, the technical guidance document for deriving EQS specifies to raise the MAC-EQS to the AA-EQS.