Section 721.4740 - Alkali metal nitrites(a)Chemical substances and significant new use subject to reporting.(1) The category of chemical substances which are nitrites of the alkali metals (Group IA in the periodic classification of chemical elements) lithium, sodium, potassium, rubidium, cesium, and francium, is subject to reporting under this section for the significant new use described in paragraph (a)(2) of this section.(2) The significant new use is: Use as an ingredient in metalworking fluids (as defined in 40 CFR 721.3 ) containing amines.58 FR 27944, May 12, 1993, as amended at 58 FR 34204, June 23, 1993