. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 24 J. D. BOON III AND W. G. MACINTYRE Table 1. Boron concentrations (ppni) in Rap- pahannock River sediment. Core no. Run 1 Run 2 •Distance (N. Mi.) 1 — 2 3 4 5A 5B 6 7 8 9 10 11 * Linear distance upstream from first core at buoy R"6" off Towles Point. £ 120 Q. Q. ^ 100 8
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 24 J. D. BOON III AND W. G. MACINTYRE Table 1. Boron concentrations (ppni) in Rap- pahannock River sediment. Core no. Run 1 Run 2 •Distance (N. Mi.) 1 — 2 3 4 5A 5B 6 7 8 9 10 11 * Linear distance upstream from first core at buoy R"6" off Towles Point. £ 120 Q. Q. ^ 100 80- 60 40- 20- 40 0 5 10 15 20 25 30 35 DISTANCE (NAUTICAL MILES) Fig. 2. Boron concentration vs distance upstream. _ 120. SALINITY (%.) Fig. 3. Boron concentration ^•s average salinity. ing in ppm by a factor of ten. The standard rock sample W-1 of the Geological Survey was analyzed as a check for the absolute accuracy of the technique. Values of 3 to 14 ppm were obtained by the au- thor, as compared to the rejiortetl value of 17 ppm. These low readings are believed to result from incomplete separation of boron from the ferromagncsian matrix material of W-1, a diabase, so that a loss of boron and inclusion of intei'fering ele- ments may have occurred during its anal- ysis. Standard clays are not now available and acidic rock standards contain no ap- preciable boron. To avoid contamination, iS^algene lab- ware was used exclusively, the only excep- tions being some Pyrex centrifuge bottles coated inside with Gulf Microwax, and the necessary platinum hardware. In addition to the boron analyses, pi- pette analyses (Krumbein and Pettijohn, 1938) were run on the undried portions of the initial samples and sand-silt-clay per- centages were determined. Also, organic carbon analyses were made on the remain- ing portions of the samples using a Leco carbon analyzer (after washing the samples with dilute acid to remove cai'l)onate). Results Results of the boron analys
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