"scant impact" is correct and usable in written English.
It is typically used to mean that a particular event or action had only a small or insignificant effect. For example: "Despite the media coverage, the new policy had scant impact on public opinion."
A subsequent trial showed scant impact after twelve weeks.
South Korea and Japan have both offered fiscal incentives, but these have had scant impact.
Optimists note that the housing slowdown has so far had scant impact on consumer spending.
It was more significant that Javier Hernández and, in particular, Rooney made scant impact in attack.
That many of the cars, engines, crew chiefs and mechanics at the 500 hailed from Britain made scant impact.
In 2001 Wall Street's losses had scant impact on consumption.That was largely due to the housing market.
The phenols and furans showed potent inhibitory effects at a concentration of 1 g L−1, whereas organic acids had scant impacts at a concentration of up to 2 g L−1.
But for the most part he struggled through the role with scant emotional impact, his eyes fixed on his score, his hand cupping his left ear, probably to shut out instruments hindering his sense of pitch.
Literature on the potential human health impacts of SRM is scant, and such impacts have not been adequately factored into previous cost-benefit analyses [ 63 ].
With a few exceptions such as Harry Truman's surprise victory in 1948, which sent the S&P 500 tumbling almost four percent in one day America's elections generally have a scant short-term impact on financial markets.
But while the measures adopted here may have scant near-term impact on the warming of the planet, the international process for dealing with the issue got a significant vote of confidence.
