ASTM E2250-02 PDF

Full title and description

ASTM E2250-02 — Standard Method for Determination of Endotoxin Concentration in Water‑Miscible Metalworking Fluids. This method describes procedures for sampling and quantitatively estimating Gram‑negative bacterial endotoxin concentrations in water‑miscible metalworking fluids (MWF).

Abstract

ASTM E2250-02 provides a short, practical test method for analysts and on‑site users to measure endotoxin levels in water‑miscible metalworking fluids. The method is intended to produce an estimate of endotoxin concentration (for monitoring and fluid‑management decision making) and to reduce inter‑laboratory variability, but it is not intended to establish exposure limits or directly relate measured concentrations to health outcomes. The original publication date is 2002; the document was later withdrawn and its role superseded by later practice(s).

General information

• Status: Withdrawn (withdrawal noted in 2008; method subsequently superseded by later practice).
• Publication date: October 10, 2002 (designation E2250‑02).
• Publisher: ASTM International.
• ICS / categories: Examination of water for biological properties / occupational health and safety related categories (commonly listed under ICS codes for biological testing of fluids).
• Edition / version: E2250‑02 (2002 edition).
• Number of pages: 3 (concise method document).

Scope

This method covers quantitative sampling and determination of Gram‑negative bacterial endotoxin concentrations in water‑miscible metalworking fluids (MWF). It is intended for users familiar with handling MWF and provides an on‑site indication or laboratory estimate of endotoxin concentration; it does not purport to relate concentration to health effects and does not replace other broader practices or standards. The method aims to minimize interlaboratory variation but cannot ensure uniformity of results.

Key topics and requirements

• Target analyte: bacterial (Gram‑negative) endotoxin in water‑miscible MWF.
• Sampling recommendations for MWF to obtain representative aliquots for endotoxin assay.
• Analytical approach: quantitative endotoxin assay (historically references include Limulus amebocyte lysate (LAL)–type assays and assay variations such as fluorescence polarization techniques in related guidance).
• Reporting units and interpretation: endotoxin concentration reported as endotoxin units (EU) or equivalents; method provides estimates rather than exposure limits.
• Quality and interlaboratory considerations: provisions to reduce variability between laboratories; users should follow good laboratory and chain‑of‑custody practices.
• Safety notes: the standard states it does not address all safety concerns and users must establish appropriate safety and health practices when handling MWF.

Typical use and users

Typical users include industrial hygiene teams, occupational health laboratories, metalworking fluid suppliers and formulators, quality laboratories in machining/manufacturing facilities, and researchers studying MWF microbial contamination. The method is used for monitoring fluid condition, troubleshooting microbial contamination, and informing fluid‑management actions (draining, cleaning, biocide dosing).

Related standards

ASTM E2250‑02 has been withdrawn and its role has been taken over by later ASTM practice(s) for endotoxin determination in MWF — notably ASTM E2657 (editions such as E2657‑11, E2657‑16, and E2657‑21), which explicitly replace Method E2250 and provide an updated practice for quantitative endotoxin analysis in water‑miscible metalworking fluids. The withdrawn method and later practice reference other ASTM terminology and sampling guides (for example, standards addressing terminology for occupational health and sample chain‑of‑custody).

Keywords

endotoxin; metalworking fluids (MWF); Limulus amebocyte lysate (LAL); endotoxin units (EU); fluorescence polarization; Gram‑negative bacteria; bioaerosols; occupational hygiene; fluid management.

FAQ

Q: What is this standard?

A: ASTM E2250‑02 is a concise ASTM test method published in 2002 for the determination of endotoxin concentration in water‑miscible metalworking fluids. It provided procedures for sampling and estimating Gram‑negative bacterial endotoxin levels in MWF.

Q: What does it cover?

A: It covers quantitative sampling and analytical procedures to estimate endotoxin concentrations in water‑miscible MWF. The method focuses on producing actionable estimates for monitoring and fluid management rather than establishing occupational exposure limits.

Q: Who typically uses it?

A: Industrial hygienists, occupational and environmental testing laboratories, MWF formulators and users in machining and metalworking operations use this type of method to monitor microbial contamination and guide maintenance and biocide decisions.

Q: Is it current or superseded?

A: ASTM E2250‑02 was published in 2002 and subsequently withdrawn (withdrawal noted in 2008). Its functions have been superseded by newer ASTM practice(s) — most notably the E2657 series (E2657‑11, E2657‑16, E2657‑21) which explicitly replace Method E2250 with updated procedures. Users should follow the current E2657 edition for up‑to‑date practice.

Q: Is it part of a series?

A: E2250 was a single, short method document; its subject area (endotoxin testing in MWF) is now covered by the E2657 practice series, and related ASTM standards cover terminology, sample handling, and other testing or guidance for metalworking fluids.

Q: What are the key keywords?

A: Endotoxin; MWF; metalworking fluids; LAL; endotoxin units (EU); Gram‑negative bacteria; bioaerosols; fluorescence polarization; occupational hygiene.