On-line turbidimeters vs benchtop (fwd)

• To: Water Science Network <water@gibbs.oit.unc.edu>
• Subject: On-line turbidimeters vs benchtop (fwd)
• From: Water Science Network Administrator <wsn-adm@mmlds1.pha.unc.edu>
• Date: Wed, 14 Jun 1995 23:44:18 -0400 (EDT)

Sender: Al Airone <71150.3415@compuserve.com>
Subject: WSN: On-line turbidimeters vs benchtop

We recently began using some on-line turbidimeters (Great Lakes Instruments)
and noticed that they routinely show higher readings (by ca. 0.5-0.6 NTU) than
concurrent manual grab samples read on a Hach 2100A turbidimeter. Has anyone
encountered a similar bias, or have any thoughts as to the reason? We suspected
air bubbles as a possible cause: concurrent particle counts showed particle
sizes < 10 microns, and we have been told that air does not show up at size
levels below 10 microns. Can anyone confirm this size characteristic for air
bubbles? Thanks.

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