New Test Method for Inductively Coupled Plasma–Optical Emission Spectrometric Determination of Cadmium and Lead Extracted from Ceramic Foodware
1. Scope
This method describes procedures for using inductively coupled plasma-optical emission spectrometry
(ICP-OES) to quantitatively determine cadmium and lead extracted by acetic acid at room temperature
from the food-contact surface of foodware. This method is applicable to food-contact surfaces of silicatebased
materials
(earthenware,
glazed
ceramicware,
decorated
ceramicware, decorated glass, and lead
crystal glass).
Keywords
Cadmium and lead
Rationale
Cadmium and lead are extracted from the food-contact surface of test vessels by filling with 4% acetic
acid to within 6-7 mm of overflowing and leaching for 24 hours at 22 ± 2 °C (same extraction procedure
, and EAM
Method 4.1). Portions of resulting analytical solutions are used to prepare test solutions for analysis.
Cadmium and lead concentrations in test solutions are determined by inductively coupled plasma-optical
emission spectrometry using a standard curve and linear least squares regression. Background correction
is used to compensate for variable background emission contribution to analyte signal. Quality control
procedures are incorporated for monitoring laboratory contamination and interference effects to ensure
data quality.
The title and scope are in draft form and are under development within this ASTM Committee.
Work Item Status
Date Initiated: 11-21-2025
Technical Contact: Charles Baldwin