Weigh the filters in an environmentally controlled area or chamber. Record the filter tare weight,
(mg).
a. Zero the balance before each weighing.
b. Handle the filter with forceps (nylon forceps if further analyses will be done).
c. Pass the filter over an anti-static 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.