Methods total alkaloids in Nitraria was extracted by acid-base and the content of total alkaloids was determined by the acidic dye colorimetry.

方法采用酸碱提取法提取总碱，以硫酸阿托品为对照品，酸性染料比色法测定白刺总生物碱的含量。

youdao

The oxide content and surface acidic groups determine the surface chemical property of carbon black.

炭黑的氧含量、表面酸性含氧基团决定了炭黑的表面化学性质。

youdao

The interference of reductant is eliminated by indirect iodimetry in the weak acidic medium and the content of potassium iodate is determined by direct iodimetry under acidic condition.

在弱酸性介质中，利用间接碘量法消除还原物的干扰，于酸性条件下采用直接碘量法测定碘酸钾含量。

youdao

So we get nice ripening but then we cool off very quickly, which allows the grapes to have--to maintain their high acidic content longer as they're ripening.

NPR: Ramona Valley: New American Viticultural Area