The Comptroller shall prescribe the manner in which claims for supplies, materials, equipment and contractual services purchased or contracted for shall be submitted, examined, approved and paid. There shall continue to be, from the appropriations of the state agencies, a Department of Administrative Services Revolving Fund of such amount as the Commissioner of Administrative Services, with the approval of the Governor, determines to be necessary to defray such current expenses for supplies, materials, equipment and contractual services as will be incurred by the commissioner in anticipation of the future requirements of state agencies or under other conditions necessitating the payment of such expense prior to the determination of the legal or equitable claims to be charged on account of such expenses to the appropriations of such agencies. Claims on account of such expenses shall be paid from said revolving fund. Any such expenses which cannot be specifically allocated to particular state agencies shall be apportioned monthly by the commissioner, with the approval of the Standardization Committee, among the state agencies for which they were incurred in such manner as the commissioner deems equitable. All funds received in payment of such claims shall be credited to said revolving fund.