Just two shipments of around 16 metric tonnes each of so-called Category 1 chemicals have left Syria's port of Lattakia this month as part of an internationally-backed disarmament plan supervised by the UN and the Organisation for the Prohibition of Chemical Weapons (OPCW).
That means less than five percent of the around 700 tonnes of chemicals that were supposed to have left Syria by December 31 last year have done so, putting the ambitious disarmament project weeks behind schedule.
The UN Security Council last year backed a US-Russian deal to eliminate Syria's vast chemical arsenal as a way to avert US strikes threatened after a massive chemical attack near Damascus that Washington blamed on the regime.
Under the agreement, Syria's entire chemical arsenal is to be eliminated by June 30.
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Syria has declared around 700 tonnes of most-dangerous chemicals, 500 tonnes of less-dangerous precursor chemicals and around 122 tonnes of isopropanol in its arsenal.
"It's almost certain that deadline will not be met," a source close to the matter told AFP.
The around 120 tonnes of isopropanol must be destroyed by March 1.
Syrian President Bashar al-Assad has been battling rebels for nearly three years, following his government's brutal crackdown on a pro-democracy uprising that began in March 2011.
Syria has claimed that operations to move the chemicals to the port of Lattakia have been slowed by the security situation in the war-torn country and by the weather.