Water isolate

Naphthalenol. 2-Naphthol or p-naphthol or 2-hydroxynaphthalene/7i3 -/5 -i7 melts at 122°C and boils at 295°C, and forms colorless crystals of characteristic, phenoHc odor which darken on exposure to air or light. 2-Naphthol [135-19-3] is manufactured by fusion of sodium 2-naphthalenesulfonate with sodium hydroxide at ca 325°C, acidification of the drowned fusion mass which is quenched ia water, isolation and water-washing of the 2-naphthalenol, and vacuum distillation and flaking of the product. A continuous process of this type has been patented (69). The high sulfate content ia the primary effluent from 2-naphthol production is greatiy reduced ia modem production plants by the recovery of sodium sulfate. 

OC-Hydroxycarboxylic Acid Complexes. Water-soluble titanium lactate complexes can be prepared by reactions of an aqueous solution of a titanium salt, such as TiCl, titanyl sulfate, or titanyl nitrate, with calcium, strontium, or barium lactate. The insoluble metal sulfate is filtered off and the filtrate neutralized using an alkaline metal hydroxide or carbonate, ammonium hydroxide, amine, or alkanolamine (78,79). Similar solutions of titanium lactate, malate, tartrate, and citrate can be produced by hydrolyzation of titanium salts, such as TiCl, in strongly (>pH 10) alkaline water isolation of the... 

A tube has failed in one of the four condensers about once every three years. If a condenser tube fails, the affected condenser can be removed from service by closing four isolation valves (propane vapor inlet valve), liquid propane outlet valve, cooling water supply valve, and cooling water return valve). However, if a tube fails, it is essential that the operator close the two propane isolation valves before closing the two water isolation valves. Closing the two water valves first would allow pressure to build on the tube side of the condenser and rupture the tube head. 

Fig. 9. Stereoview of the inclusion compound between host 5 (extended conformation) and 2 mol of N,N-dimethylacetamide (denoted by S ) + 2 mol of water (isolated circles). In the crystal structure there are hydrogen bonds between the solvent molecules and the —COOH and > S02 groups of the host (crystal data a = 14.838, b = 14.818, c — 14.500 A, a = p = y = 90°, space group...

Although sampling and subsequently extracting analytes of interest is the standard method of soil analysis, sometimes it is advantageous to be able to sample and analyze the soil solution without addition of extractant. To do so, the soil solution can be collected in the field by collecting water that has percolated through a soil profile. Alternately, soil samples can be taken and the water isolated in the laboratory. In either case, the question as to the validity of the results of analytical analysis will depend on the status of the soil and the questions being asked. 

Waste water Isolation via extraction with chloroform or SPE, addition of or elution with methanol, volume reduction. HPLC/EC 50-100 ng/L 94 (4% RSD) Riggin and Howard 1979... 

Values at 25 C for the hydrolysis rate constants of chlorpyrifos in sterilized natural waters and in water isolated from a 25 g/1 slurry of EPA-14 in distilled water (stirred for 1 week prior to separation of the sediment and water phases) are... 

Sephadex G-200 water isolation of sialoglycosamino-glycans from rat brain 124... 

This procedure may be varied by using 0.9 equivalents of NaOH as the base or by using methanol containing as much as 40% water. Isolation of the product is accomplished by evaporating methanol, acidifying the water solution, and then crystallizing the excess enantiomer out of methanol. 

In summary, when SPE is conducted using Q8, Nexus, or PPL, the recovery of DOM (as DOC) ranges from 17% to 43% in seawater, with higher yields in estuarine and coastal waters. Isolated samples are typically enriched in chromophores, fluorophores, and aromatic compounds, and they are relatively depleted in nitrogen, relative to DOM in unprocessed seawater. 

Phosphorus pentoxide (0.0367 mol) was dissolved in 50 ml of methane sulfonic acid by heating the mixture to 80°C and then cooling to ambient temperature. The solution was next treated with phenyl acetic acid (0.0367 mol) and stirred for 4 days at ambient temperature. The solution was subsequently precipitated in 1000 ml water, isolated, and repeatedly washed with water until a neutral pH was observed. After drying the... 

Does the alkalinity of a natural water (isolated from its surroundings) increase, decrease, or stay constant upon addition of small quantities to the following ... 

G.F.Stmiste, J.M.Bingham, W.D.Spall, J.W.Nickols, R. J.Okinaka,andD.J.-C. Chen, Fractionation of an Oil Shale Retort Process Water Isolation of Photoactive Genotoxic Components, presented at the conference on Short Term Bioassays in the Analysis of Complex Environmental Mixtures, Chapel Hill, NC, 22 January 1982 Los Alamos National Laboratory report LA-UR-82-1272. 

Rigorous water isolation procedures (slip blinds) Active... 

Trace enrichment of polar pesticides from water Isolation of polar drug metabolites Reversed-phase application - hydrophobic phase Isolation of hydrophobic species from aqueous solution Drugs from serum, urine, and plasma Peptides in serum and plasma Normal-phase application—polar neutral phase Isolation of low to moderate polarity species from non-... 

Kerr, R.A. and Quinn, J.G., 1975. Chemical studies on the dissolved organic matter in sea water. Isolation and fractionation. Deep-Sea Res., 22 107—116. 

Synthesis of 4,4 -(l,4-phenylenedioxy)diphthalonitrile (for a description of the preparation of different oxy-, arylenedioxy- and alkylenedioxy-bridged diphthalonitriles see [67,68]) 11.01 g (100 mmol) hydroquinone was dissolved in 100 mL dry DMSO under nitrogen. After addition of 15.85 g (60 mmol) fuse-dried K2CO3 the solution was stirred for 15 min. 19.05 g (110 mmol) 4-nitrophthalonitrile was added, and the solution was stirred for 20 h at RT. The reaction product was precipitated by pouring the solution into 1 L cold 0.5 wt.-% aqueous HCl. The isolated product was dissolved in 250 mL acetone and 5 g activated charcoal was added. After filtration the tetracarbonitrile was precipitated with distilled water, isolated and dried in vacuo over O4O10. Yield of-90% (mp 251 °C). IR (KBr) 2225, 1245 cm. MS (70 eV) 362 (100%, M ). 

Taxonomic Group Isolates from Total of 39 River Water Isolates (18) Water Isolates (21)... 

Taxonomic Number of Isolates from Total Number of River Water Isolates Number of Formation Water Isolates Sulfate... 

Dissolved oxygen concentrations in water isolated from the atmosphere commonly range from 0 to 120 % of the saturation concentration. Determinations of oxygen in samples collected in shallow waters with very high phytoplankton productivity occasionally result in oxygen concentrations equivalent to more than 300 % oxygen saturation (e.g., Krom et al,... 

The two feed water control valves and the two feed water isolation valves must close automatically on reactor trip, and the main feed pmnps must be automatically aligned with the start-up feed lines, to ensure more precise steam generator level control imder low feed flow conditions. 

The two start-up feed water control valves and the two start-up feed water isolation valves close automatically in response to the protection and monitoring system detecting potential over-cooling of the reactor coolant system (a low Tcom signal) or potential over-filling of a steam generator (Section 10.4.9.2.2 of Reference 6.1). 

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