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Method for In Situ Field Calibration of Fiber Optic Miniprobes

Division of Ecosystem Sci., Dep. of Environmental Science, Policy, and Management, Univ. of California, Berkeley, CA 94720-3110 USA

View larger version (28K): [in a new window]   Fig. 1 (A) Schematic of the fiber optic miniprobe (FOMP) measurement system, (B) a diagram of the jacket point tracer injection method used in silica sand, and (C) the external tube point tracer injection method used in clay loam soil

View larger version (31K): [in a new window]   Fig. 2 (A, D) Step calibration data for the conventional calibration procedure, (B, E) point injection calibration, and (C, F) the associated calibration curves for replicated experiments in silica sand

View larger version (37K): [in a new window]   Fig. 3 (A, D, G) Step calibration data for the conventional calibration procedure, (B, E, H) point injection calibration, and (C, F, I) the associated calibration curves for replicated experiments in clay loam soil

View larger version (28K): [in a new window]   Fig. 4 Breakthrough curves (BTCs) of normalized concentration from the conventional and point injection methods in (A) silica sand and (B) clay loam soil

View larger version (27K): [in a new window]   Fig. 5 (A) Step calibration, (B) calibration curve, and (C) measured BTCs from FOMP 1 and the (D) Step calibration, (E) calibration curve, and (F) measured BTCs from fiber optic miniprobe (FOMP) 2 using the point injection method in the field clay loam soil