IS 3025 : Part 85 : 2025/ISO 23256 : 2023 Methods of Sampling and Test (Physical and Chemical) for Water and Wastewater - Part 85 Detection of Selected Congeners of Polychlorinated Dibenzo-p-dioxins and Polychlorinated Biphenyls - Method Using a Flow Immunosensor Technique
NATIONAL FOREWORD
This Indian Standard (Part 85) is identical to ISO 23256 : 2023 'Water quality - Detection of selected congeners of polychlorinated dibenzo-p-dioxins and polychlorinated biphenyls - Method using a flow immunosensor technique' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of Water Quality Sectional Committee and approval of the Chemical Division Council.
The Indian Standard IS 3025 : 1964 'Methods of sampling and test (physical and chemical) for water used in industry' prescribes the methods of test for various parameters in water and wastewater. The Committee responsible for formulating this standard has decided to harmonize the methods of test prescribed in IS 3025 with those prescribed in ISO standards. Accordingly, the Committee decided to retain IS 3025 and publish the harmonized/adopted test methods published by ISO in various parts of IS 3025 as this standard is widely recognized by water testing laboratories. The Committee had further decided to publish the new test methods adopted/harmonized standards as a new standard and as a subsequent part/section of IS 3025.
This standard specifies methods and principles for detection of selected congeners of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated biphenyls (PCBs) in water and wastewater using a flow immunosensor. The flow immunosensor utilizes antibodies specific to 2,3,7,8-tetrachlorodibenzopdioxin (2,3,7,8-TCDD) and 3,3',4,4',5-pentachlorobiphenyl (3,3',4,4',5-PeCB), which have the highest toxic equivalent factor (TEF) value among the congeners of each of PCDDs and PCBs.
The method is applicable to timely monitoring of selected congeners of 2,3,7,8-TCDD and 3,3',4,4', 5-PeCB in water and wastewater to prioritize those for subsequent confirmatory determination.
The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appears referring to this standard, they should be read as 'Indian Standard'; and
b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.