Performance Verification Statement for the Campbell Scientific Instruments pH Sensor

Ref. No. [UMCES] CBL 2015-008

ACT VS15-01

Liu, X., Patsavas, M., and Byrne, R.H. 2011. Purification and characterization of meta-cresol

purple for spectrophotometric seawater pH measurements. Environmental Science and

Technology 45:4862-4868.

Millero F.T., Graham T.B., Huang, F., Bustos-Serrano, H., and Pierrot, D. 2006. Dissociation

constants of carbonic acid in seawater as a function of salinity and temperature. Marine

Chemistry 100:80-94.

National Environmental Laboratory Accreditation Conference (NELAC). 2003. NELAC

Standard. EPA/600/R-04/003. Washington, DC.

Pierrot, D., Lewis, E., and Wallace, D.W.R. 2006. MS Excel Program Developed for CO2

System Calculations. ORLN/CDIAC-105, Carbon Dioxide Information Analysis Center, Oak

Ridge National Laboratory, U.S. Department of Energy. Oak Ridge, TN.

United States Department of Energy (U.S. DOE). 1994. Handbook of Methods for the Analysis

of the Various Parameters of the Carbon Dioxide System in Sea Water; version 2, A.G. Dickson

and C. Goyet, (eds.) ORNL/CDIAC-74.

United States Environmental Protection Agency (U.S. EPA). 2003. Guidance on Assessing

Quality Systems. EPA/240/R-03/002: EPA QA/G-3. Washington, DC.

United States Environmental Protection Agency (U.S. EPA). 2006a. Guidance on Technical

Audits and Related Assessments for Environmental Data Operations. EPA QA/G-7: EPA/600/R-

99/080. Washington, D.C.

United States Environmental Protection Agency (U.S. EPA). 2006b. Data Quality Assessment: A

Reviewer’s Guide. EPA/240/B-06/002: EPAQA/G-9R. Washington, DC.

United States Environmental Protection Agency (U.S. EPA). 2006c. Data Quality Assessment:

Statistical Tools for Practitioners EPA/240/B-06/003: EPA QA/G-9S. Washington, DC

United States Environmental Protection Agency (U.S. EPA). 2008. Guidance on Environmental

Data Verification and Data Validation EPA/240/R-02/004: EPA QA/G-8. Washington, DC

Yao, W., and Byrne, R. H. 2001. Spectrophotometric determination of freshwater pH using

bromocresol purple and phenol red. Environmental Science and Technology 35:1197-1201.