โ Scribed by L.V. Shannon; M.J. Orren
No coin nor oath required. For personal study only.
A rapid method for the determination of polonium-210 and lead-210 in sea water Polonium-zro and lead-zxo in the natural environment have been the subject of much atten.tion in recent years. Radon-zza escapes from the surface of the land into the atmospl~ere, where it decays via short-lived daughters to lead-zro and its daughters. Data for polonium-210 and lead-zro in the atmosphere and rains have been given by several authorsL-7. Other authors have reported these nuclides in biological materials including foodstuffs, tobacco, blood, human and animal tissues and marine lifes-1".
Little work has been clone on either polonium-zxo or lead-zxo in sea water. Lead-2x0 was first detected in sea water by RAMA et czl.1" and subsequently these findings were considered in more detail by Go~nu~~c 17. These observations were made on a small number of large sea water samples collected in the Eastern Pacific and the method emyloycd involved coprecipitation of the lead followed by anion exchange and P-counting. The lead-zro content ranged from about 0.10 desintegrations min-11-l in the upper water layers to 0.28 disintegrations min-1 l-1 at a depth of 2000 m. No values for the polonium-zro level in sea water seem to have appeared in scientific journals, although some data are given in two institutional report.+,"'. I?OLSO;M~~ used iron(lI1) hydroxide as a scavenger on large sea water samples followed by a-counting and reported a mean polonium -2x0 value of 0,037 pCi 1-l (or 0.08 disintegrations rnin-1 l-1) for samples collected from Scripps Pier.
I~LYNN~" found that polonium is strongly adsorbed on to glass and, as it was evident from theoretical considerations that the polonium-2x0 content of sea water would be very small (i.e. at a level of I part in 1020 or x021), a cautious sampling and storage procedure was adoptecl.
๐ SIMILAR VOLUMES
Tap water samples of 400 ~1 were added to 280 ~1 of matrix-modifying solution consisting of hydrochloric acid, calcimn chloride, mercu&II), ethanol, Triton X-100 and bismuth(IIIJ as internal standard and contained in disposable 2-ml Eppendorff sample tubes. The mixture was analysed for copper(B) and
This work deals with a simple, rapid, and efficacious design for the measurement of 137Cs in seawater . An adsorption filter is fabricated by coating copper(II) hexacyanoferrate(II) (CuCF) onto a densely twilled nylon cloth . The CuCF-nylon cloth filter is cut into round pieces and screwed into a po