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WASHINGTON — Unable to find a country willing to dispose of Syria’s chemical weapons, the United States is considering plans to place the chemical components of the weapons on a barge where they would be dissolved or incinerated, according to senior U.S. officials.

The two systems under review are intended to destroy the precursor materials that are designed to be combined to form chemical munitions. Syria’s smaller arsenal of operational chemical weapons would be destroyed separately, officials said.

Officials from the Organization for the Prohibition of Chemical Weapons, which is operating in Syria to locate and identify the weapons, would monitor the destruction, which would be carried out
following safety standards set by legislation in the U.S. and the European Union, according to officials familiar with the proposal. Officials did not say whether any chemical residue would be dumped in the ocean.

The system could be operational in 75 days.

The seaborne options have received more serious consideration after Albania on Friday turned down a U.S. appeal to destroy the weapons on its territory; the decision came after street protests by thousands of Albanians. Norway rejected an earlier request, saying it did not have the expertise or the facilities to destroy the weapons. The issue caused a major political dispute there as well.

Under one plan, five incinerators operating at temperatures of 2,700 degrees aboard the barge would be able to destroy all of Syria’s most serious precursor materials for chemical weapons in less than 60 days. Officials said the byproducts would be harmless salts and other solids.

No U.S. companies, ships or personnel would be involved under this proposal, although officials said it was possible that the U.S. military would help provide security in the international waters where the barge would be situated, whether by assigning warships or surveillance planes to the mission.

The second proposal focuses on a highly sophisticated mobile system developed by the Pentagon, known as the Field Deployable Hydrolysis System, which is designed to convert chemical agents into compounds that cannot be used for military purposes by mixing them with water and other chemicals and then heating them, U.S. officials said.

The system, which the Pentagon says can be operated within 10 days of being shipped to a new location, would be used to neutralize the large quantities of precursor chemicals that could be used by the Syrian government to make sarin and other forms of poison gas and thus replenish its chemical weapons arsenal.

Secretary of State John Kerry, according to administration officials, was referring to the two proposals in remarks Monday when he was asked whether the effort to destroy Syria’s chemical weapons, as mandated by the United Nations, had stalled.

“We are not without other alternatives,” he said. “In fact, we are actively pursuing two other alternatives, which provide us a complete capacity to do the destruction and to meet the schedule.”

Kerry praised the process now under way as “a remarkable event.”

“The chemical weapons of one country are being corralled and moved and contained and placed under the supervision of an international organization, which is committed to removing those weapons from Syria by the end of the year,” he said. “And I believe we are on target currently to achieve that.”

Administration officials said Tuesday that the proposals represented an effective solution to the question of how the weapons would be destroyed once they were removed from Syria.

“These are among the options we are considering, as we have unique capabilities that can be applied to the disposition” of Syrian chemical weapons, said Caitlin Hayden, a spokeswoman for the National Security Council.

Another senior official said the option of destroying the munitions at sea was “logical.”

“There’s convincing evidence that these options would render the chemicals neutral at sea,” said the official, who spoke on the condition of anonymity because the final means of destroying the chemicals has not been decided.

But the official said the United States had not given up on finding a country that would accept the 1,000 tons of precursors and other chemicals in Syria’s arsenal, where the Organization for the Prohibition of Chemical Weapons would oversee the chemicals’ destruction.

The important step now, the official said, is to secure the chemicals — now stored mostly in one-ton and two-ton containers — and transport them safely to a Syrian port for loading onto ships.

“The key now is to get it onto a ship and get it out of the country,” the administration official said, noting that the weapons could be kept there for days or weeks until a decision is reached to either take them to a country for destruction or to neutralize them at sea.

By destroying the weapons in international waters, the effort would not require approval by any particular country, but environmental activists might voice opposition.

U.S. officials remain concerned that the Syrian chemical weapons will be vulnerable to attack and possible seizure as they are transported from their storage sites to a port over roads that are battlegrounds today.

Security for the shipments is being provided entirely by Syrian military units loyal to President Bashar Assad, who has surprised U.S. officials with how quickly he has complied with an agreement brokered by Russia to identify and turn over his chemical weapons stockpiles.

Syria has agreed to a deadline of Dec. 31 for destroying the most critical material, and Feb. 5 for most of the rest.

The Organization for the Prohibition of Chemical Weapons, which announced the plan for removing the materials late Friday, is expected to train Syrian forces to package, seal and safeguard the containers for transportation in truck convoys to the port from 23 declared weapons sites.