NSF ANSI 42-2020 pdf free download – Drinking Water Treatment Units – Aesthetic Effects.
NOTE—Manufacturers may not be privy to formulation information, so they may not be able to assist a testinglaboratory to identify a standard for the compound that extracted.Refer to Section 4.3.1.2 when themanufacturer does not have material formulation information.
4.1.3.3 Unknown contaminants detected by Gc/MS analysis for which identification is unable to be madeafter performing the steps in Section 4.3.1 shall be reported in accordance to Section 4.1.4.2.
4.1.3.4 The concentration of active agents or additives used in the drinking water treatment process shallbe evaluated in the product water as specified in Section 6.10.The concentration of active agents oradditives used in the drinking water treatment process shall not be evaluated during extraction testing.
4.1.3.5 Whole system or component assembly extraction testing may be waived if components, whenseparately tested, meet the requirements of this Standard and are assembled in a manner that does notintroduce any new components or materials，increase the surface area-to-volume ratio of previouslyevaluated components, or present potential concern based on cumulative factors. The reported extractableconcentrations for components shall be arithmetically added to ensure that the whole system or componentassembly meets the allowable levels in accordance with Tables 4.1,4.2, and,4.3 NSF/ANSICAN 61, andNSFIANSICAN 6O0.
4.1.4Data reporting
4.1.4.1 All contaminants identified and detected at or above the reporting limit (RL) shall be reported withthe identification of the contaminant, the concentration, and whether it exceeds the acceptance criteria asrequired in Section 4.1.3.Contaminants detected at or below the RL shall be reported to the manufactureras less than the RL’s value.
Example: lf the lab’s RL is 1.0 mg/L for analyte “X” and the concentration was detected at 0.5 mgL, the labshall report less than 1.0 mg/L or < 1.0 mg/L.
4.1.4.2 lf the extractable contaminant cannot be identified following the procedures in Section 4.3.1 , thelaboratory shall supply the manufacturer with the approximate molecular weight along with any additionalinformation about the compound.
4.2 Materials evaluation
Complete formulation information on any material not certified as specifically compliant with the sections ofthe Us Code of Federal Regulations, Title 21, listed in Table 4.4,shall be reviewed to determine whetherthe material presents a health effects concern in contact with drinking water and to assess the material’spotential for contributing contaminants to the drinking water.As a minimum level of information for thosematerials requiring submission of formulation information, the complete chemical identity and proportion byweight (in some cases approximate weights or proportions may suffice) and ingredient sources of supplyshall be provided.
The following additional information is required when available:
– a list of the known or suspected impurities within the product or material and the maximum percentor parts by weight of each impurity;
– the water solubility, hydrolysis products,and extraction rates of chemicals within the product ormaterial; and
– a list of toxicological studies relevant to the chemicals and impurities present in the product.component, or material.
4.2.1 Analytical methods All analyses shall be conducted in accordance with the applicable method(s) referenced in Section 2.
4.2.1.1 The laboratory shall validate the analytical method to the RL concentration following the procedures established in the referenced method. The laboratory shall evaluate its method detection limit (MDL) in reference to the RL. In all cases, the RL shall be equal or greater than the MDL. When preparing its calibration standards, the lowest calibration point shall be at or less than the RL.
4.2.1.2 For extracted techniques (e.g., US EPA Method 625), regarding the concentration of the lowest calibration point, the laboratory shall apply the concentration factor due to sample preparation. For example, a sample 1 L extracted, and the extract concentrated to 1 .0 mL, for a factor of 1 ,000, if the RL is set to 0.2 µg/L, then the lowest calibration point would be at or less than 0.2 mg/L.NSF ANSI 42 pdf download.