Mark Lyall Grant, the British ambassador to the UN and the current president of the Security Council, said that the US made the report after a video-conference briefing by Sigrid Kaag, who heads the international effort to rid Syria of its chemical weapons.
He said Kaag reported that a meeting was held in Beirut on earlier Tuesday to work out methods to destroy the 12 chemical production facilities that Syria has declared. She said it will take about six months to complete.
Lyall Grant said he reported to the closed council meeting that Britain will complete its destruction of Syrian chemical precursors intended for the production of chemical weapons and hydrochloric acid "in the course of this week."
"So, good progress on the destruction of chemicals outside Syria," he said.
Syria agreed to surrender its chemical arsenal last year when the US threatened missile strikes in retaliation for a chemical attack on a rebel-held suburb of Damascus. The attack is believed to have killed more than 1,000 people.
In early July, some 600 metric tons of Syria's most toxic chemicals were transferred onto the US cargo vessel MV Cape Ray in the Italian port of Gioia Tauro. The ship moved into international waters and began the two-month process of destroying the chemicals.
Lyall Grant said the US informed the council that once it has neutralised all the chemicals, the residue will be sent to Germany and Finland for final disposal, AP reported.
He said Kaag, who heads the joint mission of the United Nations and the Organisation for the Prohibition of Chemical Weapons, also briefed the council on the ongoing discussions about discrepancies in the Syrian government's initial declaration of its chemical weapons and precursor chemicals.