MPAES WAVELENGTH CALIBRATION

Thank you sir for the best answers.

I have another question to ask.

My new MPAES 4210 is just a year old. My plan is to Analyse metals for Lube Oil Condition Monitoring for mine fleets.

However, I find bit difficult to get the correct calibration. I used two-point calibration standards as 0ug/g, 100ug/g and 900ug/g (for Additives). MPAES software error message signal me as;

1. QC setup failed.

2. QC calibration validation failed

Hence, seeking any advice to get the MPAES calibration set up for Organic Lube Oils.

Thank you for your kind assistance

Tabubil

Parents
  • Thank you for this response.

    My calibration standards used for analyzing wear, additives and contaminants metals in lube oils as follows;
    1) Blank - made from 1ml Oil Base in 10ml Narrow Cut kerosene
    2) 100ug/g - made from 500ug/g multi-element. (10gram in 100gram oil base).
    3) 900ug/g additive standard.

    Error message I got as follows;
     QC error.

    Can you provide advice;
    1) Correct standards or number of standard used.
    2) Correct preparation method

    Thank you for your response.

    Regards
    Luke 


Reply
  • Thank you for this response.

    My calibration standards used for analyzing wear, additives and contaminants metals in lube oils as follows;
    1) Blank - made from 1ml Oil Base in 10ml Narrow Cut kerosene
    2) 100ug/g - made from 500ug/g multi-element. (10gram in 100gram oil base).
    3) 900ug/g additive standard.

    Error message I got as follows;
     QC error.

    Can you provide advice;
    1) Correct standards or number of standard used.
    2) Correct preparation method

    Thank you for your response.

    Regards
    Luke 


Children
  • Typically, with wear metals analysis, you make a 1:10 dilution by weight of sample (oil) in kerosene. This means the ratio of oil to solvent is 1g:10g, and therefore when you prepare your calibration standards, they must also be 1g:10g oil to kerosene.   

    You must prepare everything by weight, not by volume.

    Blank (0ug/g):   10 grams base oil up to 100 grams kerosene

    Calibration std 1  (10ug/g): take 2 grams of 500ug/g multielement std, add 8 grams of base oil, and make up to 100 grams with kerosene

    Calibration std 2 (50ug/g): take 10 grams of 500 ug/g multielement std and make up to 100 grams with kerosene

    Calibration std 3 (90ug/g): take 10 grams of 900ug/g  additive std and make up to 100 grams with kerosene

    I also recommend the use of an internal standard for this analysis. 

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