Water soluble substances Not more than 0.3%
See description under TESTS
Acid soluble substances
Asbestos
Not more than 2%
See description under TESTS
Absent
Electron microscope method (tentative): Prepare a sample to be as
homogeneous as possible. Examination of a specimen of the sample from a
minimum of 100 fields of view using a transmission electron microscope fails
to reveal any fibrous material.
Lead (Vol. 4) Not more than 5 mg/kg
Determine using an atomic absorption technique appropriate to the specified
level. The selection of sample size and method of sample preparation may be
based on the principles of the method described in Volume 4, “Instrumental
Methods.”