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Dissolved flow injection analysis

Numata, M., Funazaki, N., Ito, S., Asano, Y., and Yano, Y., Flow injection analysis for hypoxanthine in meat with dissolved oxygen detector and enzyme reactor, Talanta, 43,2053,1996. [Pg.41]

Vinas et al. [46] also determined penicillamine by chemiluminescence - flow injection analysis. The sample was dissolved in water, and a portion of resulting solution was introduced into an FIA system consisting of 5 mM luminol in 0.1 M KOH-boric acid buffer (pH 10.4), 50 pM Cu(II), and 10 mM H202 eluted at 7.2 mL/min. Chemiluminescent detection was used, the calibration graphs were linear from 0.1 to 10 mM of penicillamine, and the coefficients of variation were from 1.2% and 2.1%i. [Pg.142]

Vinas et al. [47] determined penicillamine routinely by using batch procedures and FIA. A capsule was dissolved in water, diluted to 250 mL, and a suitable portion of the solution treated with 1 mM Co(II) solution (2.5 mL) and 2 M ammonium acetate (2.5 mL). The mixture was diluted to 25 mL and the absorbance of the yellow complex was determined at 360 nm. Calibration graphs were linear for 0.02-0.3 mM of penicillamine. The method was modified for flow injection analysis using peak-height or peak-width methods, but in both cases the flow rates were maintained at 3.3 mL/min. For the peak-height technique, calibration graphs were linear for 0.1-2 mM, and the sampling frequency was 150 samples per hour. For the peak-width method, the response was linear for 50 pM to 0.1 M, and this method was particularly useful for routine determinations. [Pg.142]

Flow injection analysis is a rapid method of automated chemical analysis that allows for quasi-continuous recording of nutrient concentrations in a flowing stream of seawater. The apparatus used for flow injection analysis is generally less expensive and more rugged than that used in segmented continuous flow analysis. A modified flow injection analysis procedure, called reverse flow injection analysis, was adopted by Thompson et al. [213] and has been adapted for the analysis of dissolved silicate in seawater. The reagent is injected into the sample stream in reverse flow injection analysis, rather than vice versa as in flow injection analysis. This results in an increase in sensitivity. [Pg.103]

Eirod et al. [352] determined sub-nanomolar levels of iron (II) and total dissolved iron in seawater by flow injection analysis with chemiluminescent detection in amounts down to 0.45 nmol/1. [Pg.184]

Flow injection analysis (FIA) is a robust method for automating complex chemical analyses (Ruzicka and Hansen, 1988). It is relatively simple and can be adapted for use with a variety of detectors, including spectrophotometers, fluorometers, mass spectrometers, and electrochemical analyzers. It has been used on board ships to determine dissolved nutrients (Johnson et al., 1985) and trace metals (Sakamoto-Arnold and Johnson, 1987 Elrod et al., 1991). Unsegmented continuous flow analysis (CFA) systems based on the principles of FIA can operate in situ over the entire range of depths found in the ocean (Johnson et al., 1986a, 1989). [Pg.75]

Pullin, M. J., and S. E. Cabaniss. 2001. Colorimetric flow-injection analysis of dissolved iron (II) and total iron in natural waters containing dissolved organic matter. Water Research 35 363-372. [Pg.211]

One of the most basic characteristics of a compound is its molecular mass in this context, much of today s popularity of MS can be traced back to the simplicity of molecular mass readout from API spectra. A common experiment is flow injection analysis (FIA). Here, an autosampler is used to inject an aliquot of dissolved sample into a liquid stream, which is provided by an LC pump, to the MS-detector. FIA offers the advantages of easy automation and fast cycle times of about 30 s per sample. In order to increase throughput, multiprobe autosam-... [Pg.285]

Delmas, D., Frickla, M. G., and Linley, E. A. S. (1990). Dissolved primary amine measurement by flow injection analysis with o-phthaldialdehyde Comparison with high performance liquid chromatography. Mar. Chem. 29, 145—154. [Pg.1264]

Flow Injection Analysis [10,11], Flow injection analysis involves injecting a known volume of sample solution into a continuous flowing liquid carrier stream usually of the same solvent that the sample is dissolved in (Figure 2.18). A loop of fixed volume is attached to a rotating valve which can be connected and disconnected manually or by computer to a flowing stream between sample analyses. As the loop is fixed the volume... [Pg.42]

I.D. McKelvie, B.T. Hart, T.J. Cardwell, R.W. Cattrall, Speciation of dissolved phosphorus in environmental samples by gel filtration and flow-injection analysis, Talanta 40 (1993) 1981. [Pg.448]

T. Korenaga and H. Ikatsu, Flow Injection Analysis System with Personal Computer Application to a Fully Automated Method for the Measurement of Dissolved Chemical Oxygen Demand in River Waters [in Japanese]. Bunseki Kagaku, 31 (1982) 517. [Pg.403]

W. A. McCrum, Determination of Dissolved Humic Substances in River Waters Using Flow Injection Analysis with Fluorimetric Detection. Anal. Proc., 23 (1986) 307. [Pg.465]

Peat, D.M.W., McKelvie, I.D., Matthews, C.P., Flay-garth, P.M. and Worsfold, P.J. (1997) Rapid determination of dissolved organic phosphorus in soil leachates and runoff waters by flow injection analysis with on-line photo-oxidation. Talanta 45, 47-55. [Pg.292]

The peroxide method has proven to be the most useful for this purpose, owing to the high acidity of the medium in which the reaction is conducted. Interferences are observed only in the presence of V, Mo, or F, but these species are not normally present in U.S.P. grade titanium dioxide. In the spectrophotometric assay method, the absorption maximum at 410 nm is used to determine the titanium concentration after the oxide is dissolved [39]. The spectrophotometric endpoint of the peroxide method has been combined with flow injection analysis techniques to yield an automated procedure [40]. [Pg.686]

Lunvongsa S., Oshima M. and Motomizu S. (2006) Determination of total and dissolved amount of iron in water samples using catalytic spectrophotometric flow injection analysis. Talanta, 68, 969-973. [Pg.445]

Yang, X.R., Measurements of dissolved-oxygen in batch solution and with flow-injection analysis using an enzyme electrode. Biosensors, 4, 241, 1989. [Pg.979]

A second common linker is the acid cleavable linker. Treatment with 95% TFA cleaves the ligand. Evaporation and re-dissolution in acetonitrile prepares the sample for MS. For example, 50 pL of TFA was added to each vial, and the vials were left at room temperature for 60 minutes. The TFA was evaporated to dryness, and the sample re-dissolved in 25 uL of acetonitrile. Methanol is to be avoided at this point because methanolic TFA, even if dilute, is an effective methylating milieu. The mass spectrum is most readily obtained by positive ion electrospray ionization. But we also employ negative ion electrospray when advantageous. Flow injection analysis can be used for sample introduction but conventional or capillary LC provide better sensitivity and the opportunity to compare LC/UV and LC/MS profiles for more complete characterization. [Pg.217]

Various analytical methods now employ amperometric measurements as part of their procedures. In particular, amperometric titrations have been widely used for the analysis of various substances in samples ranging from water to radioactive materials. Also, amperometric sensors, such as the dissolved oxygen probe and various amperometric biosensors, are widely used for clinical, environmental, and industrial monitoring. Furthermore, amperometric detectors have gained considerable use since the 1970s in high-performance liquid chromatographic determination of various substances and in flow injection analysis. [Pg.80]

Flow-injection methods Flow-injection techniques have been developed and studied for the determination of free chlorine in industrial formulations and water samples. Figure 5 shows a schematic diagram of a flow-injection analysis (FIA) assembly that employs a gas-permeable membrane (0.5 pm Fluoropore, Milli-pore) as a gas diffusion unit to separate dissolved chlorine from other potential matrix interferents. [Pg.302]

Physical separation of inorganic ions and other low-molecular analytes from the particulate and dissolved macromolecular fractions of the sample is useful in different flow instruments. Dialysis and UF membrane cells are amongst practical systems for flow injection analysis (FIA), which serve to exclude any unwanted sample material so that only the analyte reaches the reaction or sensing zone. SoHd particles and large interfering molecules can be separated using membranes from the smaller species of analytical interest. Such cells can also be used in the continuous-flow, stopped-flow, and sequential injection modes of flow analysis. The membrane preseparation units are very attractive because they are simple, repeatable, require little or no pretreatment of sample, and show no interferences from sample color and turbidity in most cases no reaction in the membrane interface is involved. [Pg.2985]

If a fixed concentration of IDH and saturating amounts of isocitrate and NADP+ are used, the rate of the enzymatic reaction is proportional to the concentration of magnesium over the range from 1.0 X 10 to 2.0 X 10- moll Spectrophotometric methods can be applied to both dissolved and immobilized enzymes. Immobilized enzyme columns are increasingly being used in flow injection analysis as a means of increasing the sample throughput. [Pg.4514]


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