Trace levels of tungsten can be determined at a graphite electrode using anodic stripping voltammetry. Tungsten is concentrated at the electrode surface after reduction to Wv as a insoluble ternary complex in the presence of rhodanide ions and antipyrine (ANT) or 4-dimethyl-aminoantipyrine (pyramidon, PYR). The optimal conditions of this determination are: electrolyte 1 M H2S04 containing 0.078 M NH4SCN + 0.04M ANT or 0.02M PYR; deposition potential -0.5OV; sweep from -0.4 to -0.05V using differential pulse stripping technique. Detection limit is 1 x 10-9M (0.2 pg/L) for a 180 s accumulation time (with a relative standard deviation of 15%). Results obtained for waste waters, steel and olive leaves are reported.

Èññëåäîâàíû âîçìîaeíîñòè ìåòîäà àòîìíî-ýìèññèîííîé ñïåêòðîìåòðèè ñ èíäóêòèâíî-ñâÿçàííîé ïëàçìîé (ÀÝÑ-ÈÑÏ) äëÿ îïðåäåëåíèÿ íèçêèõ ñîäåðaeàíèé (0,001-0,01) % àëþìèíèÿ â ñòàëÿõ. Âûáðàíû àíàëèòè÷åñêèå ëèíèè àëþìèíèÿ è ñïîñîá ïðîáîïîäãîòîâêè, íàéäåíû îïòèìàëüíûå îïåðàöèîííûå ïàðàìåòðû åãî îïðåäåëåíèÿ. Ðàçðàáîòàíà ìåòîäèêà îïðåäåëåíèÿ àëþìèíèÿ â ñòàíäàðòíûõ îáðàçöàõ óãëåðîäèñòûõ è íèçêîëåãèðîâàííûõ ñòàëåé. Ïîêàçàòåëè òî÷íîñòè ïîëó÷åííûõ ðåçóëüòàòîâ ñîîòâåòñòâóþò íîðìàòèâíûì òðåáîâàíèÿì, ïðåäúÿâëÿåìûì ê òî÷íîñòè îïðåäåëåíèÿ àëþìèíèÿ â ïðîäóêöèè ÷åðíîé ìåòàëëóðãèè. Êëþ÷åâûå ñëîâà: àëþìèíèé; îïðåäåëåíèå; àòîìíî-ýìèññèîííàÿ ñïåêòðîìåòðèÿ ñ èíäóêòèâíî-ñâÿçàííîé ïëàçìîé; ñòàíäàðòíûå îáðàçöû; ïîêàçàòåëè òî÷íîñòè; ñòàëü.