BS EN ISO 7027-1-2016 (2019) PDF

Full title and description

STB BS EN ISO 7027-1:2016 — Water quality — Determination of turbidity — Part 1: Quantitative methods. This entry corresponds to ISO 7027-1:2016 and its European/British adoption as EN/BS EN ISO 7027-1:2016 (with a national adoption record appearing in 2019 in some catalogues under the prefix STB). The part specifies standard quantitative optical methods (nephelometry and turbidimetry) for determining turbidity in water samples.

Abstract

ISO 7027-1:2016 defines two quantitative optical methods for turbidity measurement: (a) nephelometry (measurement of diffuse/scattered radiation) for low-turbidity waters, reported in nephelometric turbidity units (NTU or FNU), and (b) turbidimetry (measurement of attenuation of transmitted radiation) for higher turbidity waters, reported in formazin attenuation units (FAU). The document covers instrumentation, sampling and sample handling, calibration (formazin reference), procedures, expression of results and reporting.

General information

• Status: Published / Active (international standard; also published as EN ISO and implemented as BS EN).
• Publication date: ISO edition published June 2016 (ISO 7027-1:2016). British implementation published 2016 with a corrigendum noted in February 2019. The STB/ national listing in some catalogues carries a 2019 adoption date.
• Publisher: International Organization for Standardization (ISO); also published/adopted by CEN/BSI as EN ISO / BS EN.
• ICS / categories: 13.060.60 (Examination of physical properties of water).
• Edition / version: ISO 7027-1:2016 (1st edition, 2016). National/European adoptions carry the same technical text; corrigenda published 2019 in some national forewords.
• Number of pages: ISO publication lists 9 pages. National/EN/BS published versions may include additional national foreword pages.

Scope

This part of ISO 7027 specifies quantitative optical methods for determination of turbidity in water using nephelometers and turbidimeters. It gives requirements for sampling and sample handling, apparatus and reagents (notably formazin calibration materials), instrument calibration and verification, measurement procedures (nephelometry for low turbidity and turbidimetry for high turbidity), expression of results and reporting, and guidance on minimizing interferences such as dissolved colour and air bubbles.

Key topics and requirements

• Two standard quantitative techniques: nephelometry (diffuse/scatter measurement) and turbidimetry (attenuation/transmission measurement).
• Units and typical ranges: nephelometric results in NTU (or FNU) — typically <0.05 NTU up to ~400 NTU depending on instrument; turbidimetric results in FAU — typically tens to thousands of FAU.
• Calibration: use of formazin as primary calibration material; guidance on suitable secondary standards and calibration procedures.
• Sampling and handling: clean, bubble-free sampling containers, prompt analysis or controlled storage (cool, dark), allow temperature equilibration before measurement.
• Instrument parameters and comparability: wavelength, detector angle and optical geometry affect results; consistent use and documentation required for comparability.
• Interference mitigation: recommendations to reduce colour interference (selection of measurement wavelength) and to avoid bubble/air interference and stray light.
• Reporting: expression of results in standard units, method description, calibration status and uncertainty remarks as required in the test report.

Typical use and users

Adopted by environmental and water laboratories, water utilities (drinking and wastewater), regulatory bodies, instrument manufacturers and researchers. Typical uses include compliance monitoring, process control in water treatment, environmental monitoring, instrument validation and interlaboratory studies.

Related standards

Related documents include ISO 7027-2:2019 (Part 2 — semi‑quantitative methods for assessment of transparency such as transparency tubes and Secchi-type discs) and older ISO 7027:1999 (withdrawn). National or regional equivalents and complementary methods include EPA Method 180.1 (nephelometric turbidity) and Standard Methods 2130B. Users should consult the relevant national/regional implementation (EN, BS, STB) for national forewords and corrigenda.

Keywords

turbidity, nephelometry, turbidimetry, NTU, FNU, FAU, formazin, water quality, turbidity calibration, optical turbidimeter, nephelometer, sampling, ISO 7027.

FAQ

Q: What is this standard?

A: ISO 7027-1:2016 (published as EN ISO and implemented as BS EN ISO 7027-1:2016) is the international standard that specifies quantitative optical methods for the determination of turbidity in water (nephelometry and turbidimetry), including calibration and reporting requirements.

Q: What does it cover?

A: It covers instrument principles, sampling and sample handling, apparatus and reagents (notably formazin calibration standards), calibration procedures, measurement methods for nephelometry and turbidimetry, expression of results and reporting, and guidance to reduce common interferences (colour, bubbles, stray light).

Q: Who typically uses it?

A: Environmental and analytical laboratories, drinking- and wastewater utilities, regulatory agencies, instrument manufacturers and researchers concerned with measurement and control of suspended particles and water clarity.

Q: Is it current or superseded?

A: ISO 7027-1:2016 is the current Part 1 edition (first published 2016) and has been adopted as EN/BS EN ISO 7027-1:2016; some national forewords/corrigenda were issued in 2019. Part 1 remains current; Part 2 (ISO 7027-2:2019) complements Part 1 with semi‑quantitative transparency methods. Users should check their national standards body for the latest confirmed status or any subsequent revisions.

Q: Is it part of a series?

A: Yes — ISO 7027 is a multi-part set. Part 1 (quantitative turbidity methods) is ISO 7027-1:2016 and Part 2 (semi‑quantitative transparency methods) is ISO 7027-2:2019. Earlier single‑document editions (ISO 7027:1999) have been superseded by this multipart structure.

Q: What are the key keywords?

A: turbidity; nephelometry; turbidimetry; NTU; FNU; FAU; formazin calibration; water quality; optical turbidimeter; nephelometer.