유도결합 플라스마 원자 방출 분광법에 의한 LPG엔진에 사용된 윤활유 시료중의 마모금속 분석

Abstract

LPG엔진에서 사용된 윤활유중의 마모금속 성분(Al, Fe, Cr, Si, Mg, Ca, P, Zn)들의 분석을 유도결함플라스마 원자 방출 분광법으로 실시하였다. 시료는 LPG를 사용하는 14대의 택시로부터 일정거리를 주행한 다음에 채취하여 분석하였다. 유도결합플라스마 원자 방출 분광기로 8종 원소의 동시분석에 필요한 최적 조작조건은 다음과 같았다. 1. 불꽃놀이 : RF코일에서 16mm높이, 2. 시료분무 압력 : 125KPa, 3. 알곤기체유속 : 플라스마(냉각용)-11.7L/min, 보조흐름 기체-1.7L/min, 시료부문용-0.4L/min, 4.라디오 주파 발진기 전력 : 1,400W, 5.측정방법 : 10,000km주행시까지 계속 사용해도 Si이외의 마모금속 함량은 경고값에 미치지 않았으며 이 값들은 다음과 같았다. Al : 15.6-32.7ppm, Fe : 26.2-95.8ppm, Cr : 3.0-16.7ppm, Si : 11.9-33.0ppm(10.0-19.6ppm at 8.000km 차량번호 3903은 예외), Mg : 0.0038-0.043%, Ca : 0.055-0.185%, P : 0.075-0.10%, Zn : 0.100-0.132%. 일반적으로 이 값들은 낡은 차량에서 채취한 시료일수록 새것에서 채취한 것들보다 높은 경향을 보인다.

Some analytical results of were metals(Al, Fe, Cr, Si, Mg, Ca, P and Zn) in an engine oil used by an LPG car were obtained by using Inductively coupled plasma atomic emission spectrometer. The samples were taken from 14 commercial LPG car at certain travelling distance;5,000km, 8,000km, 10,000km 18,000km and 20,000km. The optimum operating condition of the instrument for the simultaneous multi-elements determination was as follows : 1. Torch height : 16mm above the RFcoil, 2. Nebulization pressure : 125KPa, 3. rgon flow rate plasma (coolant) : 11.7L/min, auxiliary :1.7L/min, nebulizer(carrier) :0.4L/min, 4. RF(radio frequency) power : 1.400(forward), and 1.0W(reflected), 5. Intergration time : 10 sec x 3.The engine oil once charged in a LPG car could be used up to 10.000km of travelling distance because the analytical result of the wear metals in the used lubricationg oil was below the value of warning limit (except Si) as follows : Al : 15.6-32.7ppm, Fe : 26.2-95.8ppm, 0.043%, Ca : 0.055-0.185%, P : 0.075-0.10%, Zn : 0.100-0.132%. In general, the results showed higher values for old cars than those from new car.

Some analytical results of were metals(Al, Fe, Cr, Si, Mg, Ca, P and Zn) in an engine oil used by an LPG car were obtained by using Inductively coupled plasma atomic emission spectrometer. The samples were taken from 14 commercial LPG car at certain travelling distance;5,000km, 8,000km, 10,000km 18,000km and 20,000km. The optimum operating condition of the instrument for the simultaneous multi-elements determination was as follows : 1. Torch height : 16mm above the RFcoil, 2. Nebulization pressure : 125KPa, 3. rgon flow rate plasma (coolant) : 11.7L/min, auxiliary :1.7L/min, nebulizer(carrier) :0.4L/min, 4. RF(radio frequency) power : 1.400(forward), and 1.0W(reflected), 5. Intergration time : 10 sec x 3.The engine oil once charged in a LPG car could be used up to 10.000km of travelling distance because the analytical result of the wear metals in the used lubricationg oil was below the value of warning limit (except Si) as follows : Al : 15.6-32.7ppm, Fe : 26.2-95.8ppm, 0.043%, Ca : 0.055-0.185%, P : 0.075-0.10%, Zn : 0.100-0.132%. In general, the results showed higher values for old cars than those from new car.