PARTICULATES NOT OTHERWISE REGULATED, TOTAL 0500

DEFINITION: total aerosol mass CAS: NONE RTECS: NONE

METHOD: 0500, Issue 2  EVALUATION: FULL Issue 1: 15 February 1984

Issue 2: 15 August 1994                           

OSHA : 15 mg/m3

PROPERTIES:  contains no asbestos and quartz less than 1%                                                      NIOSH: no REL

ACGIH: 10 mg/m3 , total dust less than            

1% quartz 

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SYNONYMS: nuisance dusts; particulates not otherwise classified

SAMPLING                                                                                MEASUREMENT

 

 

TECHNIQUE:    GRAVIMETRIC (FILTER WEIGHT

 

ANALYTE:                    airborne particulate material

 

BALANCE:                                 0.001 mg sensitivity

use same balance before and after

sample collection

 

CALIBRATION:  National Institute of Standards and

Technology Class S-1.1 weights or

ASTM Class 1 weights

 

RANGE:                      0.1 to 2 mg per sample

 

ESTIMATED LOD:         0.03 mg per sample

 

PRECISION (Sr  ):               0.026 [2]]

 

 

 

 

 

 

 

 

 

 

 

 

SAMPLER:               FILTER

(                                  (tared 37-mm, 5-µm PVC filter

FLOW RATE:           1 to 2 L/min

 

VOL-MIN:              7 L @ 15 mg/m

     -MAX:                       133 L @ 15 mg/m

 

SHIPMENT:             routine

SAMPLE STABILITY:             indefinitely

 

BLANKS:                    2 to 10 field blanks per set

 

 

BULK

SAMPLE: none required

 

 

 

 

ACCURACY

 

 

RANGE STUDIED:             8 to 28 mg/m3

 

BIAS:                                   0.01%

 

OVERALL PRECISION (SrT):     0.056 [1]

 

ACCURACY:                        ± 11.04%

 

APPLICABILITY: The working range is 1 to 20 mg/m3  for a 100-L air sample. This method is nonspecific and determines the total dust concentration to which a worker is exposed. It may be applied, e.g., to gravimetric determination of fibrous  glass [3]in addition to the other ACGIH particulates not otherwise regulated [4]

 

 

INTERFERENCES: Organic and volatile particulate matter may be removed by dry ashing [3].

 

 

OTHER METHODS: This method is similar to the criteria document method for fibrous glass [3] and Method 5000 for carbon black. This method replaces Method S349 [5]. Impingers and direct-reading instruments may be used to collect total dust samples, but these have limitations for personal sampling.

EQUIPMENT:

Sampler: 37-mm PVC, 2- to 5-µm pore size membrane or equivalent hydrophobic filter and -1

supporting pad in 37-mm cassette filter holder.

Personal sampling pump, 1 to 2 L/min, with flexible connecting tubing.2-

. Microbalance, capable of weighing to 0.001 mg.3-

. 4-Static neutralizer: e.g., Po-210; replace nine months after the production date

5-Forceps (preferably nylon).

6-Environmental chamber or room for balance (e.g., 20 °C ± 1 °C and 50% ± 5% RH)

SPECIAL PRECAUTIONS: None

PREPARATION OF FILTERS BEFORE SAMPLING:.

. Equilibrate the filters in an environmentally controlled weighing area or chamber for at least 2 h   .1-

       NOTE: An environmentally controlled chamber is desirable, but not required.

2-    Number the backup pads with a ballpoint pen and place them, numbered side down, in filter

        cassette bottom sections.

3-    Weigh the filters in an environmentally controlled area or chamber. Record the filter tare weight,

         W1  (mg)

a.      Zero the balance before each weighing.

b.      Handle the filter with forceps. Pass the filter over an antistatic radiation source. Repeat this

         step if filter does not release easily from the forceps or if filter attracts balance pan. Static

electricity can cause erroneous weight readings        .

4-      Assemble the filter in the filter cassettes and close firmly so that leakage around the filter will

          not occur. Place a plug in each opening of the filter cassette. Place a cellulose shrink band

         around the filter cassette, allow to dry and mark with the same number as the backup pad.

 

SAMPLING :

 

5. 5-    Calibrate each personal sampling pump with a representative sampler in line

6. 6-     Sample at 1 to 2 L/min for a total sample volume of 7 to 133 L. Do not exceed a total filter

         loading of approximately 2 mg total dust. Take two to four replicate samples for each batch of

        field samples for quality assurance on the sampling procedure.

 

SAMPLE PREPARATION :

 7-       Wipe dust from the external surface of the filter cassette with a moist paper towel to minimize

contamination. Discard the paper towel           .

8-         Remove the top and bottom plugs from the filter cassette. Equilibrate for at least 2 h in the balance room     .

9-         Remove the cassette band, pry open the cassette, and remove the filter gently to avoid loss of Dust           .

           NOTE: If the filter adheres to the underside of the cassette top, very gently lift away by using

          the dull side of a scalpel blade. This must be done carefully or the filter will tear.   

CALIBRATION AND QUALITY CONTROL:

 

10-       Zero the microbalance before all weighings. Use the same microbalance for weighing filters

             before and after sample collection. Maintain and calibrate the balance with National Institute of

              Standards and Technology Class S-1.1 or ASTM Class 1 weights.

 

11-       The set of replicate samples should be exposed to the same dust environment, either in a

             laboratory dust chamber [7] or in the field [8]. The quality control samples must be taken with

             the same equipment, procedures and personnel used in the routine field samples. The relative

             standard deviation calculated from these replicates should be recorded on control charts and

             action taken when the precision is out of control [7].

 

MEASUREMENT:

12-       Weigh each filter, including field blanks. Record the post-sampling weight, W2  (mg). Record

             anything remarkable about a filter (e.g., overload, leakage, wet, torn, etc).

 

CALCULATIONS:

13-   Calculate the concentration of total particulate, C (mg/m2 ), in the air volume sampled, V (L):