Interlaboratory comparisons and improvements of methods for acid number determination in used motor oils |
| |
| Authors: | Elena Kardash-Strochkova Yakov I Tur’yan I Kuselman Naphtali Brodsky |
| |
| Institution: | (1) The National Physical Laboratory of Israel (INPL), Givat Ram, Jerusalem 91904 e-mail: ilya_kus@netvision.net.il Tel.: +972-2-6536 534 Fax: +972-2-6520 797, IL;(2) Oil Refineries Ltd., P.O. Box 4, Haifa 31000, Israel, IL |
| |
| Abstract: | The results of two interlaboratory comparisons of acid number determinations in used motor oils are discussed. It is shown
that the comparability of the measurement results is not as good as that required by known standards for petroleum products.
The problem is motor oil contaminants which accumulated during use, and which are the source of a matrix effect in the acid
number determination. The standard methods’ drawbacks are analyzed and some improvements are proposed. Repeatability and accuracy
of the improved methods are evaluated.
Received: 11 December 2001 Accepted: 15 February 2002 |
| |
| Keywords: | Motor oils Acid numbers Matrix effect Measurement methods Interlaboratory comparisons |
| 本文献已被 SpringerLink 等数据库收录！ |
