SilcoTek Coatings - Overview - page 69

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To ensure accurate analysis of low levels of mercury in streams sampled
from flue stacks, sampling systemsmust be inert. Laboratory testing
and field results have proven that SilcoNert 2000 treated sampling and
testing equipment is inert to active compounds such asmercury and
mercury species down to levels as low as 1ppb.
As regulations andguidelines formonitoring and controllingmercury
emissions are developed and implemented, proper equipment will be
needed for accurate sampling and analysis. Themost popularmethods
of samplingwill be basedon continuousmercurymonitoring systems
(CMMS) and sorbent tube samplers. These systems are often degraded
or compromisedby the loss of mercury species due to reactions and
adsorption of mercury species on the inner surfaces of transfer and
monitoring equipment.
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Lit Cat #SN-012
Unlike fluoropolymers, theSilcoNert2000
layer will not contaminate systemswhen
used in high temperature applications.
SilcoNert 2000 is a proprietary (U.S.
Patent #6,444,326), silicon, chemical
vapor-deposited (CVD) coating, specifically
designed to improve the chemical/mercury
inertness of steel, stainless steel, alloys,
glass, and ceramics. The unique non
line-of-siteCVDprocess produces
a flexible, high temperature capable,
amorphous silicon layer that diffuses
into themetal lattice. The coatingwill
conform to themost intricate surfaceswhilemaintaining high dimensional
tolerances. SilcoNert 2000will deformwith tubing surfaces allowing for
radius bends andwill not interferewith threaded or compression joints;
makingSilcoNert 2000 the ideal coating for process sampling and stack
sampling in coal fired generators.
The data in figure 1 compares SilcoNert 2000 treated 304 grade
stainless steel gas
sampling cylinders
(Swagelok®, Solon
OH) and untreated
sample cylinders.
Each cylinder was
filledwith 8 ug/m3 of
elemental mercury
(approximately 1part
permillion) (Spectra
Gases, Alpha
NJ). Themercury
in each cylinder
wasmeasuredover
time todetermine
the changes in
concentration.
Figure1: SilcoNert2000 treatedcylinders and sampling
componentsprovidean inert samplepathwhichprevents
adsorptionof activecompounds likemercury andensures
accurate sampling. 1
SilcoNert 2000:
Themost inert surfaceavailable
formercury sampling
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2/28 46