文档介绍：SECTION 1
PRELIMINARY OPERATIONS
OF ANALYSIS
SAMPLING
Handling the Sample in the Laboratory
Sampling Methodology
MIXING AND REDUCTION OF SAMPLE VOLUME
Introduction
Coning and Quartering
Figure Coning Samples
Figure Quartering Samples
Riffles
CRUSHING AND GRINDING
Introduction
Pulverizing and Blending
Table Sample Reduction Equipment
Table Properties of Grinding Surfaces
Precautions in Grinding Operations
SCREENING AND BLENDING
Table . Standard Sieve Series
MOISTURE AND DRYING
Forms of Water in Solids
Drying Samples
Table Drying Agents
Table Solutions for Maintaining Constant Humidity
Drying Collected Crystals
Table Concentrations of Solutions of H2SO4, NaOH, and CaCl2 Giving
Specified Vapor Pressures and Percent Humidities at 25°C
anic Solvents
Table Relative Humidity from Wet- and Dry-Bulb Thermometer Readings
Table Relative Humidity from Dew-Point Readings
Freeze-Drying
Hygroscopic lon-Exchange Membrane
Microwave Drying
Table Chemical Resistance of a Hygroscopic lon-Exchange Membrane
Critical-Point Drying
Table Transitional and Intermediate Fluids for Critical-Point Drying
Karl Fischer Method for Moisture Measurement
THE ANALYTICAL BALANCE AND WEIGHTS
Introduction
Table Classification of Balances by Weighing Range
General-Purpose Laboratory Balances
Table Specifications of Balances
Mechanical Analytical Balances
Electronic Balances
The Weighing Station
Air Buoyancy
Analytical Weights
Table Tolerances for Analytical Weights
SECTION ONE
METHODS FO