scholarly journals Gas Chromatographic Determination of Cyclohexanone Leached from Hemodialysis Tubing

1993 ◽  
Vol 76 (5) ◽  
pp. 1127-1132 ◽  
Author(s):  
Robert P Snell
Keyword(s):  
Sodium Chloride ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Correlation Coefficients ◽  
Chromatographic Determination ◽  
Chromatographic Procedure

Abstract A capillary gas chromatographic procedure is described for the determination of cyclohexanone leached from hemodialysis tubing by water. Recoveries were 100% at 2.0 mg/100 mL (20 ppm), 99.0% at 500 μg/100 mL (5 ppm), and 106% at 1.0 μg/100 mL (10 ppb). Reproducibility of the system was 0.152% for 3.0 μL injections of a solution containing cyclohexanone at 5.58 μg/mL. Correlation coefficients were 0.9983 for 0.3672-3.672 ng and 1.0000 for 3.672-367.2 ng. Twenty hemodialysis tubing sets from 4 manufacturers were examined. The leachable cyclohexanone ranged from 1.02 to 43.7 ppm per set. Rinsing the tubing with 1 L 0.9% sodium chloride solution did not remove significant amounts (P = 0.05) of leachable cyclohexanone.

Capillary Gas Chromatographic Determination of Cyclohexanone and 2-Ethyl-l-Hexanol Leached from Solution Administration Set

1991 ◽  
Vol 74 (3) ◽  
pp. 476-478 ◽  
Author(s):  
James W Danielson
Keyword(s):  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Sodium Bicarbonate Solution ◽  
Correlation Coefficients ◽  
Chromatographic Determination ◽  
Solution Ph ◽  
Preliminary Study ◽  
The Individual ◽  
Gas Chromatographic Method

Abstract A capillary gas chromatographic method is described for the determination of cyclohexanone and 2-ethyl-1-hexanol leached from solution administration sets. A preliminary study was made of compounds leached from solution administration sets by 5% sodium bicarbonate solution (pH 8.1), 0.9% sodium chloride solution (pH 6.8), and water. Water was selected as the leaching solvent because similar quantities of the compounds were leached into water and into both types of parenteral solutions. The correlation coefficients were 0.99977 for cyclohexanone and 0.99974 for 2-ethyl-1- hexanol, and recoveries were good (93-94%). Five administration sets from each of 2 manufacturers were analyzed by this method. The amounts of cyclohexanone that were leached from the individual sets varied considerably; however, similar quantities were leached from sets of both manufacturers. 2-Ethyl-1-hexanol was also found in extracts from each of the sets analyzed.

DETERMINATION OF TRACE AMOUNTS OF SILVER IN GALENA ORES

1960 ◽  
Vol 38 (9) ◽  
pp. 1488-1494 ◽  
Author(s):  
E. J. Bounsall ◽  
W. A. E. McBryde
Keyword(s):  
Aqueous Solution ◽  
Nitric Acid ◽  
Sodium Chloride ◽  
Hydrochloric Acid ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Silver Content ◽  
Aqueous Sodium Chloride Solution ◽  
Aqueous Sodium

An analytical method is described for the determination of microgram amounts of silver in galena ores, based on the "reversion" of silver dithizonate. Silver is separated from relatively large amounts of lead by extraction as dithizonate into chloroform from an aqueous 1:99 nitric acid solution. Separation from mercury, which is also extracted under these conditions and would, if present, interfere in the analysis, is achieved by reverting the dithizonate solution with a 5% aqueous sodium chloride solution which is also 0.015 molar in hydrochloric acid. Following dilution of this aqueous solution and adjustment of pH, silver is again extracted into chloroform as the dithizonate, and determined absorptiometrically. Analyses of a number of galena ore samples showed a precision of within 3% for a silver content ranging from 0.03 to 0.4%.Some other methods for isolating silver from these samples, which were tried but found unsatisfactory, are discussed.

scholarly journals The determination of ammonia in soil

1920 ◽  
Vol 10 (1) ◽  
pp. 72-85 ◽  
Author(s):  
Donald J. Matthews
Keyword(s):  
Sodium Chloride ◽  
Chloride Solution ◽  
Calcareous Soil ◽  
Sodium Chloride Solution ◽  
Complete Recovery ◽  
Partial Decomposition ◽  
Definite Time

Ammonia can be recovered from soil with an efficiency of 98·5 to 99·5 per cent, in six hours in the apparatus described.For most purposes it is sufficient to aerate the soil for three hours.Highly dunged glasshouse soils undergo partial decomposition in the cold with magnesia. In such cases the soil should be aerated with magnesia and strong sodium chloride solution for a definite time, say three hours.The complete recovery of added ammonia from a calcareous soil is difficult unless the soil is finely ground.

Capillary Gas Chromatographic Determination of Prometryn and Its Degradation Products in Parsley

1985 ◽  
Vol 68 (4) ◽  
pp. 750-753
Author(s):  
Promode C Bardalaye ◽  
Willis B Wheeler
Keyword(s):  
Sodium Chloride ◽  
Ethyl Acetate ◽  
Aqueous Phase ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Limit Of Detection ◽  
Degradation Products ◽  
Fused Silica ◽  
Saturated Sodium Chloride Solution

Abstract Residue analysis of the herbicide prometryn (2,4-bis(isopropylamino)- 6-methylthio-l,3,5-triazine) is widely known, but an analytical method for determining its metabolities or degradation products in addition to the parent chemical has not yet been reported in the literature. The procedure reported here is for the extraction and determination of prometryn and 2 metabolites, 2-amino-4-isopropylamino-6-methylthio- l,3,5-triazine and 2,4-diamino-6-methylthio-l,3,5-triazine, in parsley. Crops were extracted with 2-propanol followed by concentration of the extract and partitioning with a minimum amount of hexane in the presence of a large excess of water to remove most of the green pigment. The aqueous phase was divided into 2 equal halves: (A) Onehalf portion was partitioned with dichloromethane in the presence of saturated sodium chloride solution, the dichloromethane phase was separated, and the aqueous phase was discarded. The organic solvent was evaporated, and the contents were reconstituted in petroleum ether before prometryn analysis. (B) The other half was made slightly alkaline with ammonium hydroxide solution and was partitioned with ethyl acetate in the presence of saturated sodium chloride solution. The ethyl acetate phase was concentrated, centrifuged to remove any turbidity, and analyzed for the 2 metabolities above. Fused silica capillary gas chromatography (GC) with nitrogen-phosphorus (N-P) detection was used for quantitation. The limit of detection was 0.05 mg/kg for all the compounds examined. Recoveries from fortified parsley samples ranged from 59 to 73% at fortification levels of 0.05 to 1.0 mg/kg.

The effect of antiseptics on the crystallogenic properties of Pseudomonas aeruginosa

2021 ◽  
Vol 1 (11) ◽  
pp. 47-52
Author(s):  
Andrey K. Martusevich ◽  
◽  
Ivan V. Bocharin ◽  
Marina N. Ivashchenko ◽  
◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Sodium Chloride ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Biological Properties ◽  
Express Method ◽  
Joint Form

The aim of the work was to clarify the crystallogenic properties of pseudomonads under the action of an antiseptic. The material for the study was 8 strains of Ps. aeruginosa. In accordance with the purpose and objectives of the study, the work was carried out in 3 stages: assessment of the biological properties of the isolated pseudomonas strains; determination of sensitivity to disinfectants by the squares method; assessment of the crystallogenic (initiating) the activity of pseudomonads in an individual and joint form with a disinfectant. The tested antiseptic was "Desam" in the form of a standard 1% solution. Most of the analyzed strains turned out to be sensitive to the applied working concentration of the tested disinfectant and are active initiators of the crystallogenesis of sodium chloride solution. The revealed significant differences in the tesigraphic test conducted with pseudomonas strains sensitive and resistant to the studied disinfectant create prerequisites for the development of a new express method for determining the sensitivity of microorganisms to disinfectants.

Solid-Phase Extraction and Liquid Chromatographic Determination of Monophthalates and Phthalide ExtractedFrom Solution Administration Sets

1993 ◽  
Vol 76 (3) ◽  
pp. 531-534 ◽  
Author(s):  
Robert P Snell
Keyword(s):  
Solid Phase ◽  
Correlation Coefficients ◽  
Chromatographic Determination ◽  
Relative Standard ◽  
Chromatographic Procedure ◽  
Monobutyl Phthalate ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic ◽  
Ethylhexyl Phthalate

Abstract A liquid chromatographic procedure is described for the determination of phthalide, monobutyl phthalate, and mono-2-ethylhexyl phthalate leached by water from solution administration sets. Recoveries varied from 88.8% for phthalide at 1 (μg/50 mL to 113% for monobutyl phthalate at 6 μg/50 mL. Relative standard deviations at 1 μg/50 mL were 2.59% for phthalide, 3.54% for monobutyl phthalate, and 11.6% for mono-2- ethylhexyl phthalate. At 6 μg/50 mL, the relative standard deviation for mono-2-ethylhexyl phthalate decreased to 3.88%. Reproducibilities for 5 standard injections were 1.40% for phthalide, 1.84% for monobutyl phthalate, and 1.95% for mono-2- ethylhexyl phthalate. Correlation coefficients were 1.00 for the 3 compounds. Five sets from 2 manufacturers were examined. No phthalide or monobutyl phthalate was found. One manufacturer’s sets contained 37.6-44.4 μg/L mono-2- ethylhexyl phthalate. The sample matrix had some interference if phthalide or monobutyl phthalate was present.

scholarly journals Determination of Radiochemical Purity of 99mTc-DTPA Using One-System Method of Paper Chromatography

2019 ◽  
Vol 8 (2) ◽  
pp. 109-116
Author(s):  
Maskur Maskur ◽  
◽  
Enny Lestari ◽  
Amal Rezka Putra ◽  
Dede Kurniasih ◽  
...  
Keyword(s):  
Sodium Chloride ◽  
Mobile Phase ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Radiochemical Purity ◽  
System A ◽  
System Method ◽  
Purity Testing ◽  
The One

The more efficient and effective quality control techniques for 99mTc-DTPA are needed because 99mTc has a short half-life of around 6.0 hours. We have succeeded in developing a one-system of Thin Layer Chromatography (TLC) for radiochemical purity testing system that is faster and more practical. Two-system method of TLC for radiochemical purity testing uses mobile phase of methyl ethyl ketone indicated as system A and 0.9% sodium chloride solution indicated as system B. One-system method uses the mobile phase of a mixture solution of acetone and 0.9% sodium chloride. In this study, the determination of radiochemical purity of the one-system of TLC has been successfully developed using the Whatman-1 paper stationary phase and the mixture of mobile phase between acetone and 0.9% sodium chloride solution. The mobile phase of acetone: 0.9% sodium chloride with a ratio of 9:1 shows the most optimum results. This phase can separate 99mTc-DTPA (Rf = 0.4-0.6) from 99mTcO4- (Rf = 0.9-1.0) and 99mTcO2 (Rf = 0.0-0.1) as radiochemical impurities. This result shows that the one-system of TLC method can be used for radiochemical purity testing of 99mTc-DTPA radiopharmaceutical kits. This method can completely separate the product compound (99mTc-DTPA) from its impurities (99mTcO2 and 99mTcO4-).

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