Using dual column with flame ionization detector to determine total hydrocarbon and non-methane hydrocarbon in air.

Trace amounts of molybdenum in water and soil extract samples were determined using a dual column on-line ion-exchange preconcentration FIA-ICP system.

First, the main procedures and the distinctive features of the most-obtuse-angle (MOA) row or column pivot rules are introduced for achieving primal or dual feasibility in linear programming.