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In situ filtration

In offshore waters most of the particulate trace inorganic and organic constituents occur at extremely low particle concentrations. Their determination involves a filtration step to raise the concentration levels to the sensitivity range of instrumental analytical methods. This is specially evident for sampling of deep ocean waters where SPM contents are in the range of about 10-50/ig/L e.g., Sherrell and Boyle, 1992). For example, to allow the detec- [Pg.31]


Kharkar DP, Thomson J, Turekian KK, Forster WO (1976) Uranium and thorium series nuclides in plankton from the Caribbean. Limnol Oceanogr 21 294-299 Krishnaswami S, Lai D, Somayajulu BLK, Weiss R, Craig H (1976) Large-volume in situ filtration of deep Pacific waters mineralogical and radioisotope studies. Earth Planet Sci Lett 32 420-429 Livingston HD, Cochran JK (1987) Determination of transuranic and thorium isotopes in ocean water in solution and in filterable particles. J Radioanal Nucl Chem 115 299-308 Masque P, Sanchez-Cabeza JA, Braach JM, Palacios E, Canals M (2002) Balance and residence times of °Pb and 4 o in surface waters of the northwestern Mediterranean Sea. Cont Shelf Res 22 2127-2146 Matsumoto E (1975) Th-234-U-238 radioactive disequilibrium in the surface layer of the oceans. Geochim Cosmochim Acta 39 205-212... [Pg.490]

Krishnaswami S, Lai D, Somayajulu BLK (1976) Large-volume in-situ filtration of deep Pacific waters Mineralogical and radioisotope studies. Earth Planet Sci Lett 32 420-429 Krishnaswami S, Mangini A, Thomas JH, Sharma P, Cochran JK, Turekian KK, Parker PD (1982) °Be and Th isotopes in manganese nodules and adjacent sediments nodule growth histories and nuclide behavior. Earth Planet Sci Lett 59 217-234... [Pg.526]

A more effective approach to determining the concentration of HCs on suspended sediments is to separate the sediment from the water column and analyze it directly. Although there are several approaches to this, as described by Horowitz (1995), the least expensive and most efficient method for use on low-TSS karst spring water is large-volume filtration (LVF). This involves in situ filtration of the spring water using an apparatus that allows both a sufficient amount of material to be collected for analysis and the material in a form that lends itself to analysis. [Pg.40]

A Multiple-Unit Large-Volume In Situ Filtration System for Sampling Oceanic Particulate Matter in Mesoscale Environments... [Pg.155]

The multiple-unit large-volume in situ filtration system consists of 12 pump-filter units, an electromechanical cable, a current monitoring and switching box interfaced to an Apple II control computer, a drum winch, and a level wind (Figure 1). [Pg.157]

Figure 1. Block diagram of the multiple-unit large-volume in situ filtration... Figure 1. Block diagram of the multiple-unit large-volume in situ filtration...
We will present flow-rate, particulate dry weight, and particulate-calcium data from selected MULVFS and LVFS stations to (1) further document the sampling performance of the MULVFS and (2) demonstrate one application of large-volume in situ filtration to understanding the processes governing the distributions of particulate matter in a productive environment. Detailed presentation and interpretation of warm core ring data are outside the scope of this chapter. [Pg.168]

An example of the usefulness of large-volume in situ filtration is illustrated by the particulate Ca data collected in the interdisciplinary Warm Core Rings program. Particulate Ca in the < 53-pm size fraction showed a factor-of-three drop in concentration in the thermostad of WCR 82-B be-... [Pg.173]

The results of measurements of major ions in sediment porewaters collected by in situ filtration. Values are presented as the difference in the concentration between bottom water and porewater samples. Stations are from the continental margin and deep sea in the South Atlantic (A) on the mid-Atlantic Ridge between Rio de Janeiro and Capetown at c.2000 m (B) from the continental rise off Rio de Janeiro at 2000 m (C) from the continental slope off Rio de Janeiro at c. 1000 m and (D) from the Venezuela Basin east of Barbados at c.3000 m. Note that the concentrations of both K" " and Mg + decrease with depth in almost all cases. From Sa/les, (1979). [Pg.45]

In situ filtration probe utilizing tubular membranes (membrane not shown). The probe can be connected to the fermenter via standard ports. The tubular membrane fits directly on the inner support. Channels in this support are neccessary to collect the cell-free medium (developed at the Institut fiir Technische Chemie of the Universitiit Hannover, Hannover, Germany). [Pg.328]

Petrick G, Schulz-Bull DE, Martens V, Scholz K, and Duinker JC (1996) An in-situ filtration/extraction system for the recovery of trace organics in solution and on particles tested in deep ocean water. Marine Chemistry 54 97-103. [Pg.174]

Even though results were satisfactory and fulfill the established requirements, operational stability of the enzyme was tested in sequential batch operation, where the biocatalyst was recovered after each batch by in-situ filtration. Results were disappointing since most of the enzyme (about 90%) was desorbed during operation... [Pg.312]

In freshwaters, in situ filtration and ultrafiltration techniques are useful to distinguish Tc associated with colloidal material such as humic substances. [Pg.4140]

Vogel AP, Steynberg AP, van Berge PJ. inventors Sasol, assignee. Slurry-bed Fischer-Tropsch reactor with in-situ filtration zone for separation of catalyst from product waxes. InternaL Patent WO 0045948. August 10. 2000. [Pg.293]

In situ filtration is reviewed briefly in Chapter 2 (Section 2.1.3.3). Here we outline the procedure for the collection of suspended particulate TE with the Kiel in situ Pump (KISP) introduced by Petrick et al. (1996) and also technically described in Chapter2 (see Fig. 2-2). The system has been developed primarily for the determination of organic compounds at ultra-trace levels (see also Chapter 22). [Pg.347]


See other pages where In situ filtration is mentioned: [Pg.475]    [Pg.401]    [Pg.1185]    [Pg.3109]    [Pg.3110]    [Pg.3113]    [Pg.155]    [Pg.156]    [Pg.157]    [Pg.173]    [Pg.19]    [Pg.568]    [Pg.115]    [Pg.118]    [Pg.5]    [Pg.17]    [Pg.31]    [Pg.32]    [Pg.347]    [Pg.439]    [Pg.480]    [Pg.279]    [Pg.369]    [Pg.440]   
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