"The race went really well, just how I had planned it," wrote Payne, who also won a bronze medal in the 400m individual medley at the 2010 Commonwealth Games in India.
"I went out from the start and made sure I had enough energy left in the tank to do a sprint finish and cover any moves from the other girls."
Payne, born in South Africa, said her day had been made even better by the news that her sister, Janine, had gone into labour. The
later that her sister had given birth to a girl.
“Keri-Anne likes to lead from the front, dictate the pace and avoid all the elbows and feet. But that means she is a target for the other swimmers. What impressed me was that she had an answer every time someone challenged her. She was able to step up. It was very impressive to see someone lead like that”
Karen Pickering,Former World Championship gold medallist and BBC Radio 5 live pundit
The final squad for the 2012 Games still needs to be ratified by British swimming and the British Olympic Association but, subject to fitness and form, Payne will be included.
Payne's qualification for the Olympics earned praise from Team GB chef de mission and BOA chief executive Andy Hunt.
He stated: "Keri-Anne's outstanding performance to win gold is a terrific personal accomplishment and the Olympic qualification represents a significant milestone on the road to 2012 for Team GB.
"In terms of Team GB Olympic qualification, that's one down, around 549 to go - well done Keri-Anne Payne for getting the ball rolling."
Payne added: "Last year wasn't the best for me so this is a massive positive and I've also just found out my sister [Janine] is in labour back in the UK so hopefully it will be a good day all round."
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.