The Organization for the Prohibition of Chemical Weapons said in a statement Monday that the Syrian government had delivered its 13th shipment of chemicals to the port of Latakia.
The OPCW has set June 30 as the date Syria must remove all its chemical weapons.
Syria agreed to scrap its chemical weapons to avoid a possible military strike from the United States after an August chemical weapons attack on civilians outside Damascus. More than 1,400 people were killed.
Responding to claims that poison gas was used again last week in Syria, the U.S. ambassador to the United Nations said the United States is trying to establish what really happened before it considers a response.
Ambassador Samantha Power said Sunday the reports of poison gas use were "unsubstantiated," but the United States will do everything in its "power to establish what has happened and then consider possible steps in response."
Both sides in Syria's civil war accused the other of using gas in attacks Friday and Saturday.
In another development, United Nations human rights chief Navi Pillay has condemned the use of torture in detention facilities in Syria.
A Monday statement from Pillay said her office has documented a pattern of torture and ill-treatment in facilities run by the government and some rebel groups.
The abuses include rape, beatings, burnings and humiliation.