Firebrand senator Jacqui Lambie has beaten One Nation leader Pauline Hanson’s daughter to retain her seat after a nail biting election count.

Lambie faced a tight race for the Tasmania’s final Senate seat against One Nation’s Lee Hanson, whose mother Pauline is also a senator.

On Tuesday the Australian Electoral Commission declared Lambie had triumphed and will return to parliament for another term.

“I am very grateful that the Tasmanian people have given me the chance to fight for them for another six years,” Lambie wrote to supporters after the confirmation.

“Representing Tasmania and bringing the voices and concerns of the people to Canberra, is what gets me out of bed in the morning!

“My focus is on the Tasmanian people, especially those doing it tough.

“Interest rates are coming down and that’s good, but for many Tasmanian families it will barely touch the sides.”

Tasmania’s other senators are Labor’s Carol Brown and Richard Dowling, the Liberals’ Claire Chandler and Richard Colbeck, and Nick McKim from the Greens.

The upper house chamber will also be home to at least one new face after Labor’s landslide May 3 election win produced another surprise result.

Charlotte Walker, who had been preselected in the usually unwinnable third spot on Labor’s South Australian ticket, will become Australia’s youngest senator at just 21 years old.

The youngest person to be elected to an Australian parliament was Liberal Wyatt Roy, who was 20 when he became a member of the lower house.

Walker, who celebrated her 21st-birthday on election night, will be the youngest holder of an upper house seat.

She told the Nine Network she plans to focus on domestic violence prevention and educating young people about politics.

In the lower chamber, recounts continue in two seats after fierce contests.

Election officials in the north Sydney seat of Bradfield are undertaking a full recount after just eight votes separated Liberal candidate Gisele Kapterian from independent challenger Nicolette Boele.

Meanwhile, a partial recount is about to get underway in the inner-Melbourne seat of Goldstein, where independent Zoe Daniel was fending off Liberal candidate Tim Wilson.

The full distribution put Wilson ahead of the incumbent by 260 votes.

The Bradfield recount could take up to two weeks while the tally in Goldstein is expected to take four days. It will begin on Wednesday.

-with AAP