Method 5524

Metalworking fluids by gravimetric

This method is for the collection and analysis of airborne metal working fluids from workplace air.  The sample is collected on a 37mm PTFE filter.  The use of a cyclone is needed if collection is for thoracic particulates.  After sampling, the filter is extracted with a ternary solvent (methylene chloride:methanol:toluene 1:1:1) followed by a binary solvent (methanol:water 1:1).  The filter is dried to a constant weight and the particulate catch is determined by difference.

The total weight procedure allows for an estimate of the total particulate aerosol, including nuisance dust, airborne metal particulate, and metal working fluid.  If the extraction procedure is used, the technique estimates the total metal working fluid to which the worker is exposed.

The working range of the method is 0.05 to 2 mg/sample for a 1000L air sample. This method is similar to Method 0500.

NOTE:  This method replaces method 5026 which employs infrared anlaysis for mineral oil mist.



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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   Analyze samples within 2 weeks of sample collection.
Preservatives:   Store samples refrigerated from sample collection to analysis.
Required Preps:   Tared 37mm PTFE filter with 2 micron pore size
Collection Method:   The method recommends a flow rate of 2 L/min. for total particulate and 1.6 L/min. for thoracic particulates with a 1000L sample collection volume for both.
Analytical Methodology:   Gravimetric
Documentation:   5524

Analyte List*

Analyte Formula CAS Number Detection Limit

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.