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From time to time, Sequoia will update the
US and other International Standards known to us, that relate to
our products.
We invite visitors to our website to send us information on
relevant standards
that they feel need to be included on this page.
| | | | Laser Diffraction Standards
| | | | ISO-13320:2009
| ISO standard
describing the laser diffraction method. | ASTM B822-10
| ASTM standard describing the laser diffraction method. | | | | Turbidity Standards
| | ISO-7027:1999 | This
is a turbidity standard, reporting results in FNU (Formazin
Nephelometric Units). It is based on monochromatic light scattering at
90-degrees plus or minus 2.5-degrees. Like the USEPA turbidity standard
below, this standard has no relationship to suspended sediment mass or
volume. The conversion to suspended sediment concentration changes with
changes in sediment grain size, color, ligth wavelength, and particle
shape. For more details, we recommend visiting
http://www.omega.com/techref/ph-6.html. | | US EPA 180.1 | This
is the US version of the ISO standard mentioned above. The results are
reported in NTU (Nephelometric Turbidity Units), again with Formazin as
the standard. This method, unlike ISO-7027, this standard is more lax
(and therefore, even less reliable). The scattering angle can be 90 +/-
20-degrees. The lamp need not be monochromatic, etc. Fundamentally,
this method suffers from all the ills of the ISO method. | | | | | | | Drinking Water Standards
| EPA
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| | | | Standard Particles
| Polystyrene spheres
| For extremely precisely sized polystyrene
spheres, go to http://www.dukescientific.com/
| Glass beads
| To obtain glass beads for laboratory calibrations, visit http://www.whitehousescientific.com
| ISO-12103-1:1997
(AZ test dust)
| To obtain natural particle standards of Arizona dust, also called AC
Spark Plug Powder, and also used as a standard by USGS, contact Powder Technology Inc.
| | Turbidity Standards | To
obtain Turbidity Standards in NTU units, visit http://www.voigtglobal.com/turbidity.htm | | | | | | | | | | | | | | | |
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Ocean Optics XX
Anchorage, AK, 27-30 September 2010, booth 3
CASQA
Rancho Mirage, CA, 1-3 November, booth 11
PiE 2010
Villefranche-sur-Mer, France, 15-17 November
Sixth International Conference on Remediation of
Contaminated Sediments
New Orleans, LA, 7-10 February 2011, booth 303
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