U.S. Geological Survey Open-File Report 09-0346
Trends in Precipitation Chemistry in the United States, 1983-1994: An Analysis of the Effects in 1995 of Phase I of the Clean Air Act Amendments of 1990, Title IV

For correct display of the superscript and subscript items in this table you must have an HTML3 compatible browser. A .gif image of this file will be available here on 15 July 96.


Table A.1.

Algorithms for adjusting pre-1994 NADP/NTN data for the effects of contamination from the lid o-ring. The “cor” and “unc” subscripts designate the concentrations that are corrected or uncorrected for the o-ring. Volume (Vol) is in mL and pH is in pH units. Volume restriction categories for the algorithms with volume and pH factors are listed. These corrections effectively limit the size of the corrections at very low and very high pH values.


Volume-Only Factors:

Cacor = Caunc - (3.70/Vol) (1 - exp-0.00214Vol)

Mgcor = Caunc - (2.21/Vol (1 - exp -0.00252Vol)

NH4cor = NH4unc - (8.46/Vol (1 - exp-0.00287Vol)

Clcor = Clunc - (5.04/Vol) (1 - exp-0.00269Vol)


Volume and pH Factors:

A.

B.

C.


Go to Table of Contents
Last Update: 1536 08JUL96 kjl