Are there instructions for distilling a solid sample using the Micro Dist®?

Document ID

Document ID TE7605

Published Date

Published Date 07/31/2019
Question
Are there instructions for distilling a solid sample using the Micro Dist®?
Summary
Distilling solid samples with Micro Dist®
To distill a solid sample using the Micro Dist®, please use the instructions below:

Distill a solid sample
Use different weights to identify the best weight of sample to add to each tube for each matrix type. If the sample is high in organic content, use only 0.5 g or less of sample. If the sample is low in organic content, use up to 1 g of sample. Soil and sludge samples are diluted with deionized water.

Calculations:
Calculate the amount of sample in mg/kg after analysis:
A = C × ((1 L / l000 mL) × V)
B = A divided by (W × 1000 g/kg)
Where:
A = mg of analyte in the sample
B = mg of analyte per kg of sample (mg/kg)
C = determined concentration (mg/L)
V = dilution volume in tube (mL)
W = weight of the original sample (g)

Troubleshooting:
If foam or debris continues to get on the collector tube membrane after the sample is decreased to 0.5 g:
1. Add 4–5 mL of deionized water instead of 6 mL to the sample tube.
2. Add activated charcoal to the sample tube so that it covers the surface of the solid.
3. Fill the empty space in the sample tube with glass wool.
Note: For soil or organic samples that contain cyanide, Biobeads™, manufactured by BIO‐RAD, part number SM–2, are effective in many laboratories. Do a test on a known standard and a spiked sample that puts foam or debris on the membrane to identify if these procedures correct the problem.