Chemical weathering and carbon dioxide consumption in a small tropical river catchment, southwestern India
Baby Krishnan Nisha1, Keshava Balakrishna1*, Harikripa Narayana Udayashankar1 and Busnur Rachotappa Manjunatha2
1Department of Civil Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576107, India
2Department of Marine Geology, Mangalore University, Mangalagangothri 574199, India
*E-mail: k.balakrishna@manipal.edu
Table S1: The accuracy and precision of the measurement with known concentration and duplicate samples
Table S1: The accuracy and precision of the measurement with known concentration and duplicate samples
Known Concentration Standard (5ppm)
Measured concentration (ppm)
Certified values (ppm)
Accuracy (%)
Ca 4.88 5 2.4
Mg 4.79 5 4.2
Na 4.92 5 1.6
K 4.95 5 1.0
Cl 4.98 5 0.4
NO3 4.74 5 5.2
SO4 4.77 5 4.6
Sample Na K Mg Ca Cl NO3 SO4
Adoor post-monsoon 2017 3.55 0.71 2.00 3.65 3.25 0.29 1.17 Adoor post-monsoon 2017 3.64 0.70 2.30 3.65 3.25 0.28 1.10 Adoor post-monsoon 2017 3.34 0.78 2.11 3.65 2.25 0.28 1.30
Precision (SD) 0.15 0.04 0.15 0.00 0.58 0.01 0.10