NIST plays role in keeping tin cans lead-free.When steel mills manufacture tin-plated sheet steel for food cans, they must test the tin (Sn) and the electroplating electroplating: see plating. electroplating Process of coating with metal by means of an electric current. Plating metal may be transferred to conductive surfaces (e.g., metals) or to nonconductive surfaces (e.g. bath for lead (Pb) content. If lead is allowed to accumulate in the tin or the bath, it will become part of the tin coating and may leach into food stored in cans. In recent years, can makers reduced the allowable Pb content of tin plate in recognition of potential health risks in products used for foods. Steel mills typically purchase Sn anodes according to ASTM ASTM abbr. American Society for Testing and Materials B 339 Standard Specification for Pig Tin, with a restriction of 50 [micro]g/g Pb maximum. Residual amounts of anode anode (ăn`ōd), electrode through which current enters an electric device. In electrolysis, it is the positive electrode in the electrolytic cell. anode Terminal or electrode from which electrons leave a system. tin are typically remelted on site to form new anodes. Incoming and remelted tin anodes are analyzed by atomic emission spectrometry to meet material acceptance and process control requirements. Tin-plate is a high-volume commodity made by many U.S. and foreign steel companies. About 3 million tons of tin-plate are manufactured and shipped from U.S. steel producers annually at a typical selling value of $800 per ton during 1999. Can makers purchase much of the tin-plate to manufacture products such as food and beverage F&B is a common abbreviation in the United States and Commonwealth countries, including Hong Kong. F&B is typically the widely accepted abbreviation for "Food and Beverage," which is the sector/industry that specializes in the conceptualization, the making of, and delivery of foods. cans, automotive filter cases, and paint cans. Developed in cooperation with ASTM International, Standard Reference Material (SRM (1) (Storage Resource Management) The management of the storage resources in an organization in order to avoid duplication of files and to determine space utilization across all servers. ) 1727 Anode Tin is intended primarily for use in evaluating chemical and instrumental methods of analysis of refined pig tin for Pb content. SRM 1727 is certified for Pb content on the basis of analyses by isotope-dilution inductively-coupled plasma mass spectrometry mass spectrometry or mass spectroscopy Analytic technique by which chemical substances are identified by sorting gaseous ions by mass using electric and magnetic fields. . Information values are provided for 10 additional elements. SRM 1727 is sold in solid form (a block 30 mm on each side) for spectrometric analysis and may be chipped for use with chemical methods of analysis. CONTACT: John Sieber, (301) 975-3920; john. sieber@nist.gov. |
|
||||||||||||||||||
Printer friendly
Cite/link
Email
Feedback
Reader Opinion