It added that the toxic chemical was of high purity with an nearly complete absence of impurities.
Russia's Embassy in London questioned the authenticity of Yulia's statement, saying it was crafted to support Britain's version of events and increases suspicions that she is being held against her will.
"This transparent and open approach, which we have pursued from the outset, is in sharp contrast to the Russian state's ongoing tactics of obfuscation and distraction", the spokesman said. The Kremlin must give answers.
Both Mr. Skripal and his daughter were found unconscious on a bench in the town of Salisbury in early March, after they were poisoned.
FACEBOOK Yulia and Sergei Skripal
"There is no information at all about how, from whom, in what conditions these samples were taken".
Russian Federation has vehemently denied involvement and waged a propaganda battle to try to discredit Britain's account of the attack, which sparked an global row resulting in the expulsions of diplomats from all sides.
The obvious discrepancies between the multiple versions of the British government account and the OPCW findings have not prevented a barrage of headlines proclaiming that the United Nations agency has found in favour of British charges against Russian Federation.
The Sunday Times also reported the pair might be moved to America, and said MI6 and the Central Intelligence Agency had discussed the matter.
It does not identify the source. Russian Federation denies any involvement, saying Britain hasn't provided evidence to support its assertion. The Russian embassy in London said it would only accept the OPCW's findings if there was Russian participation.
Britain has asked for a meeting of OPCW's executive council on Wednesday to discuss the organization's findings, and Britain is also seeking a meeting of the UN Security Council next week on the chemical weapons report.
Dr Michelle Carlin, a toxicologist at Northumbria University, told HuffPost UK it was too soon to give the Skripals a proper prognosis, because knowledge of Novichok's impact on the body was limited and mostly based on historical cases.
The UK has accused the Russian state of carrying out the attack, citing a combination of classified intelligence and chemical analysis.
Sergei Skripal was granted refuge in the United Kingdom following a 2010 spy exchange between the USA and Russian Federation. Yulia was visiting from Russian Federation when they were poisoned, probably via contamination from his front door.
The 33-year-old, who was discharged from hospital on Monday, said her father is "still seriously ill".
In a statement released by the Metropolitan Police Wednesday night, Yulia thanked the Russian embassy for offering their services but said "at the moment I do not wish to avail myself of their services".
She singled out her cousin, Viktoria Skripal, who has appeared on Russian television several times since the attack, once providing a recording of a phone conversation allegedly between herself and Yulia.