ASTM D8371-24 PDF

Full title and description

ASTM D8371-24 — Standard Test Method for Trace Metal Content Analysis in Carbon Black. This method specifies procedures for determining trace metal content in carbon black using inductively coupled plasma techniques after appropriate sample digestion or ashing.

Abstract

This concise (4‑page) test method covers quantitation of trace metals in carbon black by ICP‑OES or ICP‑MS following sample preparation (microwave acid digestion or furnace ashing). It describes applicability, detection/linear ranges as dependent on instrument sensitivity and sample dilution, and limits related to elements not amenable to the digestion described (for example, silicon). The method is intended for use in quality control, materials evaluation, and regulatory assessment where metal content is relevant.

General information

• Status: Active (current edition D8371‑24).
• Publication date: 2024 (document listings indicate published/issued 1 May 2024 as D8371‑24).
• Publisher: ASTM International (American Society for Testing and Materials).
• ICS / categories: 83.040.20 (Rubber compounding ingredients / carbon black testing).
• Edition / version: D8371‑24 (current revision; replaces D8371‑20).
• Number of pages: 4.

Scope

The standard covers determination of metal content in carbon black using ICP‑OES or ICP‑MS after sufficient sample decomposition. It addresses method sensitivity as a function of instrument and dilution, linear range handling (dilutions for concentrations above calibration), and notes the limitation that some elements (e.g., silicon) may not be recovered by the nitric‑acid digestion routes described. Two sample preparation routes are described: microwave acid digestion and furnace ashing (the latter can be inappropriate for volatile elements).

Key topics and requirements

• Target analytes: trace/metal elements in carbon black relevant to product performance and regulatory considerations.
• Analytical techniques: inductively coupled plasma — optical emission spectrometry (ICP‑OES) and mass spectrometry (ICP‑MS).
• Sample preparation: microwave acid digestion and furnace ashing; choice affects recoveries and suitability for volatile or refractory elements.
• Calibration and linear range: procedures require appropriate calibration, and samples above linear range must be diluted. Detection limits depend on instrument model and matrix.
• Units and reporting: SI units are the standard for this method.

Typical use and users

Used by carbon black producers, rubber and polymer compounders, analytical laboratories, quality control/assurance teams, and regulatory/compliance personnel to quantify trace metals that can affect product properties or meet regulatory limits. Typical applications include incoming material checks, formulation control, failure analysis, and environmental/health screening.

Related standards

Closely related ASTM methods and practices referenced in the carbon black and elemental analysis context include earlier versions of this method (D8371‑20), carbon black ash and related test methods (for example D1506 series), and microwave/astringent sample decomposition practices used for elemental determinations. Users often consult complementary standards for sample handling, optimization/validation of ICP methods, and ash‑content procedures.

Keywords

carbon black, trace metals, ICP‑OES, ICP‑MS, microwave digestion, furnace ashing, heavy metals, atomic emission, spectrometry, trace elements, D8371‑24.

FAQ

Q: What is this standard?

A: ASTM D8371‑24 is a standard test method that defines procedures to determine trace metal content in carbon black by ICP‑based techniques after suitable digestion or ashing.

Q: What does it cover?

A: It covers sample preparation options (microwave acid digestion; furnace ashing), analysis by ICP‑OES or ICP‑MS, considerations for detection limits and linear range, and notes on elements that may not be recovered by the described digestion (e.g., silicon).

Q: Who typically uses it?

A: Producers and users of carbon black, contract analytical labs, rubber and polymer compounders, QC/QA teams, and regulatory analysts concerned with metal content in materials.

Q: Is it current or superseded?

A: D8371‑24 is the current active edition (2024). It supersedes the prior D8371‑20 edition; the ASTM document page shows the standard as active (last updated mid‑2024). A work item to revise D8371‑24 (WK96174) was recorded subsequently to add a precision statement, indicating a planned revision activity. Users should check ASTM listings or tracking for the latest status and any ballot/outcome dates.

Q: Is it part of a series?

A: It is part of ASTM Committee D24 carbon black standards (Book of Standards, Vol. 09.01) and is often used with other D24 test methods (ash content, sample preparation practices) and with general ICP optimization/validation practices referenced in related ASTM documents.

Q: What are the key keywords?

A: carbon black, trace metals, ICP‑OES, ICP‑MS, microwave digestion, furnace ashing, heavy metal analysis, atomic emission, spectrometry.