Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Acid mine waters analysis

Analytical chemistry can also be divided between chemical and physical methods of analysis. Chemical methods almost always involve the measurement of a mass of a chemical species or a volume of a reagent solution produced or consumed by a chemical reaction. For example, the acid in an acid mine water sample can be determined by adding exactly enough of a solution of base (NaOH) of accurately known concentration to exactly neutralize the strong acid in the sample... [Pg.512]

Table 33 Water analysis of an acid mine drainage AMD (pH = 2,3) and of a groundwater GW (pH = 6,6) (concentrations in mg/L)... Table 33 Water analysis of an acid mine drainage AMD (pH = 2,3) and of a groundwater GW (pH = 6,6) (concentrations in mg/L)...
A water sample is taken from a stream in Nevada receiving acid mine drainage. The stream passes through an area containing gypsum, CaS04. Laboratory analysis shows that the pH of the water is 4, the total concentration of sulfate (SO2-) is 6 X 10-3 M, and the total concentration of chloride (CL) is 3 X 10-4 M. (a) Assuming that the only other ionic species present is calcium (Ca2+), what is the calcium concentration in the water (b) Will the precipitation reaction,... [Pg.30]

This sensor approach has also been employed in the analysis of several relevant and contrasting water samples such as river water, acid mine drainage, and treated urban water, thus covering a wide spectnun of matrices and absolute and relative heavy metal concentrations. Residts were shown to be in good agreement with those obtained with the standard inductively coupled plasma mass spectroscopy technique [36]. Moreover, this sol-gel nanocomposite has been successfully employed for the construction of screen-printed electrochemical sensors. [Pg.1425]

Results of analysis of formic acid in diesel engine exhaust subjected to various forms of post-combustion control, i.e., catalytic oxidation and water conditioning, indicate both a reduction of formic acid due to oxidation in the catalyst and dissolution in the water scrubber. In-mine analysis of formic acid at increasing distances from a source of diesel exhaust indicates that no significant change in concentration occurs. This finding contradicts a hypothesis that formaldehyde concentration decreases with increasing distance due to gas phase oxidation to formic acid. Surface reactions may, however, be important sinks for formaldehyde. [Pg.612]

The more advanced instrumental methods of analysis, including GC, for the detection and identification of expls are presented (Ref 90) Pyrolysis of expls in tandem with GC/MS was used for the identification of contaminant expls in the environment (Ref 108). Isomer vapor impurities of TNT were characterized by GC-electron capture detector and mass spectrometry (Ref 61). Volatile impurities in TNT and Comp B were analyzed using a GC/MS the GC was equipped with electron capture and flame ionization detectors (Ref 79). The vapors evolved from mines, TNT, acetone, toluene, cyclohexanone and an organosilicon, were analyzed by GC/MS (Ref 78). Red water produced by the sellite purification of crude TNT was analyzed by GC/MS for potentially useful organic compds, 2,4-dinitrotoluene, 3- and 4-sulfonic acids (Ref 124). Various reports were surveyed to determine which methods, including GC/MS, are potential candidates for detection of traces of TNT vapors emitted from land mines factors influencing transportability of TNT vapors thru soil to soil/air interface are dis-... [Pg.783]

Fig. 8-87. Analysis of water-soluble vitamins. - Separator column Spherisorb ODS 2 (5 pm) eluent (A) 0.1 mol/L KOAc (pH 4.2 with HOAc), (B) water/methanol/acetonitrile (50 10 40 v/v/v) gradient linear, 6% B in 30 min to 100% B flow rate 2 mL/min detection UV (254 nm) injection volume 50 pL solute concentrations 5 nmol each of ascorbic acid (1), nicotinic acid (2), thiamine (3), pyridoxine (4), nicotinic add amide (5), p-aminobenzoic add (6), cyanocobala-mine (7), and riboflavine (8). Fig. 8-87. Analysis of water-soluble vitamins. - Separator column Spherisorb ODS 2 (5 pm) eluent (A) 0.1 mol/L KOAc (pH 4.2 with HOAc), (B) water/methanol/acetonitrile (50 10 40 v/v/v) gradient linear, 6% B in 30 min to 100% B flow rate 2 mL/min detection UV (254 nm) injection volume 50 pL solute concentrations 5 nmol each of ascorbic acid (1), nicotinic acid (2), thiamine (3), pyridoxine (4), nicotinic add amide (5), p-aminobenzoic add (6), cyanocobala-mine (7), and riboflavine (8).
HPLC has also been applied to the analysis of trimethylolpropane and pentaerythritols in industrial synthesis solutions, 2-mercaptobenzothiazole in waste dump effluent, polythionates in mining waste water, isocyanates in working atmospheres, carcinogenic amines, aniline in waste water, polyethylene oxide fatty acid surfactants in industrial process waters and phthalate esters in river water. [Pg.235]

In a paper on the analysis of mineral water from a place near an alum mine in Italy Lavoisier reports that the compound of alumina and sulphuric acid does not crystallise well, that to form true alum it is necessary, as M. Marggraf observed , to add fixed alkali (potash), and that the base of alum is not a simple earth, as all chemists have hitherto supposed, but a compound of an earth, with a third or half its weight of fixed alkali... as already remarked by M. Macquer (Marggraf). It is probable that alums could be formed with soda, magnesia (. ), lime, and perhaps ammonia. [Pg.636]


See other pages where Acid mine waters analysis is mentioned: [Pg.572]    [Pg.189]    [Pg.64]    [Pg.10]    [Pg.58]    [Pg.291]    [Pg.56]    [Pg.53]    [Pg.393]    [Pg.155]    [Pg.194]    [Pg.157]    [Pg.761]    [Pg.95]    [Pg.167]    [Pg.26]    [Pg.9]    [Pg.1723]    [Pg.264]    [Pg.92]    [Pg.151]    [Pg.245]    [Pg.707]    [Pg.408]    [Pg.143]    [Pg.31]    [Pg.2011]    [Pg.146]    [Pg.215]    [Pg.804]    [Pg.19]    [Pg.112]   
See also in sourсe #XX -- [ Pg.484 ]




SEARCH



Acid-mine waters

Water analysis

© 2024 chempedia.info