There shall be a treasury department. The head of the treasury department shall be the general treasurer. The general treasurer shall perform the duties required by this chapter, chapters 11 and 15 of title 5; chapter 4 of Title 35; chapter 21 of Title 44; and all other provisions of the general laws and public laws insofar as those powers and duties relate to the general treasurer and the treasury department. He or she shall receive all revenues of the state except as may otherwise be specified by law. He or she shall disburse only such sums of money as are authorized by the department of administration, except as may otherwise be provided by law.