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We have used the master equation approach to study a moderately complexnetwork of diffusive reactions occurring on the surfaces of interstellar dustparticles. This network is meant to apply to dense clouds in which a largeportion of the gas-phase carbon has already been converted to carbon monoxide.Hydrogen atoms, oxygen atoms, and CO molecules are allowed to accrete onto dustparticles and their chemistry is followed. The stable molecules produced areoxygen, hydrogen, water, carbon dioxide (CO2), formaldehyde (H2CO), andmethanol (CH3OH). The surface abundances calculated via the master equationapproach are in good agreement with those obtained via a Monte Carlo method butcan differ considerably from those obtained with standard rate equations.Comment: 13 pages, 5 figure

On the master equation approach to diffusive grain-surface chemistry: The H, O, CO system