Update to Tech Memo 2000.06, Elimination of Orthophosphate and Nitrate Analysis by Ion Chromatography.

FYI, 

Update to Tech Memo 2000.06, Elimination of Orthophosphate and Nitrate 
Analysis by Ion Chromatography. 

The Laboratory Reporting Levels  (LRLs) for Labcode (LC) 1979 
(nitrate-plus-nitrite) and LC 1977 (nitrite) were incorrect in Tech Memo 
2000.06.  The LRLs should be 0.005 mg/L for LC 1979 and 0.001 mg/L for LC 
1977.  The third paragraph of the Tech Memo should read as follows; 

Customers who require low-level results for nitrate may still obtain them 
by requesting LC 1979 (nitrate-plus-nitrite) with an LRL of 0.005 mg/L and 
LC 1977 (nitrite) with an LRL of 0.001 mg/L, and then calculating the 
nitrate value.  If low-level data are not required, customers are 
encouraged to use LC 1975 and LC 1973 where LC 1975 has an LRL of 0.05 
mg/L.  In the case of low-level methods, costs for the replacement 
labcodes are somewhat higher; however, customers who elect to use labcodes 
1975 and 1973 will realize small savings. By grouping the labcodes as 
suggested the nitrate-plus-nitrite and nitrite will be analyzed 
simultaneously under identical analytical conditions, thus providing the 
best nitrate value.  An FCC bottle is required for the replacement 
methods. 

Attached is the corrected version of Tech Memo 2000.06, please disregard 
the previous version or make a pen & ink change if you have already 
downloaded.  If there are questions or concerns please contact Gary 
Cottrell (cottrell@usgs.gov, 303-236-3490). 

I apologize for any inconvenience caused by this error. 

Gary Cottrell 

Attachment