ISO/TC 147/SC 5
| Project No. | ISO 15522:1999 |
|---|---|
| Title | <P>This International Standard specifies a method for assessing the potential toxicity of a test material to the growth of</P> <P>aerobic bacteria present in activated sludge. The inhibitory effect is restricted to those microorganisms capable of</P> <P>growth on the chosen organic test medium.</P> <P>This method gives information on inhibitory effects on the microorganisms over incubation periods up to 6 h.</P> <P>This method is applicable to water, wastewater and chemical substances which are soluble under the conditions of</P> <P>the test. Special care is needed with volatile or coloured materials and materials which form turbid suspensions or</P> <P>dispersions.</P> <P>NOTE 1 Results with volatile test material should be interpreted with caution and are likely to underestimate any inhibitory</P> <P>effect because of the difficulties in maintaining the initial concentration in the test flasks.</P> <P>NOTE 2 Coloured materials and materials of low water-solubility which form turbid suspensions or dispersions can be tested</P> <P>in many cases using colour/turbidity controls as blanks (see 9.4).</P> <P>NOTE 3 Inhibitory effects on activated sludge microorganisms of test materials for which this test is not applicable can be</P> <P>determined by using an inhibition test based on respirometric measurements (see ISO 8192).</P> |
| Registration number (WIID) | 27554 |
| Scope | <P>This International Standard specifies a method for assessing the potential toxicity of a test material to the growth of</P> <P>aerobic bacteria present in activated sludge. The inhibitory effect is restricted to those microorganisms capable of</P> <P>growth on the chosen organic test medium.</P> <P>This method gives information on inhibitory effects on the microorganisms over incubation periods up to 6 h.</P> <P>This method is applicable to water, wastewater and chemical substances which are soluble under the conditions of</P> <P>the test. Special care is needed with volatile or coloured materials and materials which form turbid suspensions or</P> <P>dispersions.</P> <P>NOTE 1 Results with volatile test material should be interpreted with caution and are likely to underestimate any inhibitory</P> <P>effect because of the difficulties in maintaining the initial concentration in the test flasks.</P> <P>NOTE 2 Coloured materials and materials of low water-solubility which form turbid suspensions or dispersions can be tested</P> <P>in many cases using colour/turbidity controls as blanks (see 9.4).</P> <P>NOTE 3 Inhibitory effects on activated sludge microorganisms of test materials for which this test is not applicable can be</P> <P>determined by using an inhibition test based on respirometric measurements (see ISO 8192).</P> |
| Status | Standarts spēkā |
| ICS group | 07.100.20 13.060.70 |