Determination of calcium in lithium salts

Effect of pH and Ionic Strength on the Distribution Coefficients of Alkaline Earth Metals and Nickel with Chelating Ion-Exchange Resins.

“…A-l has been used to separate calcium from lithium salts (14) and caustic soda (15), copper from \M ammonium chloride (17), copper, nickel, lead, iron, manganese, zinc, and cadmium from oil field waters (4) and manganese from concentrated sodium chloride (8). Leyden and Underwood (11) measured distribution coefficients (D) of several cations with Dowex A-l at various temperatures and pH values up to 7 and concluded that most divalent ions showed similar behavior exhibiting D values which became maximal at pH 4-5. They also noted that an increase 1 Present address: Bellaire Research Laboratories, Texaco, Inc., Bellaire, Tex. in ionic strength up to 1.1/ caused a decrease in the D value for copper.…”

Volumetric and Gravimetric Analytical Methods for Inorganic Compounds

“…Jones (185) described the determination of nickel, copper, zinc, and cadmium in silver solder following elution from a 100-to 200-mesh anion exchange column. A Dowex A-l chelating resin was employed effectively by Olsen et al (209) to separate trace amounts of calcium from lithium salts. Recently Wilkins and Smith (254) and Fritz and Pietrzyk (176) have shown the gain in separation factor obtained by use of hydrochloric acid-alcohol-water mixtures in ion exchange chromatography.…”

Computer techniques for identifying low resolution mass spectra

“…This approach was also investigated in the present study. To recast Equation 1 for this criterion, let Xi = 1 if channel z is among the TV most in- (3) tense peaks in the unknown Xi = 0 otherwise (4) Similar conditions hold for the channels h,• in each library member L, . The criterion of agreement in this case is simply:…”

“…The mass of the base peak of the library member must be among the 5 highest peaks of the unknown. 3. The molecular weight of the library member must be greater than an arbitrary specified fraction (generally, 0.7) of the mass of the highest unknown peak with an intensity greater than 0.5% of the total ion current.…”