Àíîòàö³ÿ ðîáîò³ ïðåäñòàâëåíî äàí³ ùîäî ðîçðîáêè âèñîêî÷óòëèâîãî ñåëåêòèâíîãî êîíäóêòî-ìåòðè÷íîãî á³îñåíñîðà äëÿ âèçíà÷åííÿ ³îí³â âàaeêèõ ìåòàë³â ó âîäíèõ ðîç÷èíàõ. ßê êîí-äóêòîìåòðè÷íèé ïåðåòâîðþâà÷ âèêîðèñòîâóâàëàñÿ äèôåðåíö³éíà ïàðà ïëàíàðíèõ çîëîòèõ ãðåá³í÷àñòèõ åëåêòðîä³â, íàíåñåíèõ íà ñèòàëîâó ï³äêëàäêó. Ðîëü á³îñåëåêòèâíîãî åëåìåíòó â³ä³ãðàâàëà òðèôåðìåíòíà ñèñòåìà (³íâåðòàçà, ìóòàðîòàçà, ãëþêîçîîêñèäàçà), ³ììîá³ë³çîâà-íà íà ïîâåðõíþ ïåðåòâîðþâà÷à, ÿêà º ÷óòëèâ³øîþ ³ ñåëåêòèâí³øîþ ó ïîð³âíÿíí³ ç ³íøèìè ôåðìåíòíèìè ñèñòåìàìè çà ðàõóíîê ñóìàðíîãî åôåêòó ³íã³áóâàííÿ òðüîõ ôåðìåíò³â. Ñï³â-â³äíîøåííÿ ôåðìåíò³â â ìåìáðàí³ ï³äáèðàëè åêñïåðèìåíòàëüíî, ìàþ÷è íà ìåò³ äîñÿãíåííÿ íàéá³ëüøî¿ ÷óòëèâîñò³ á³îñåíñîðà ÿê äî ñóáñòðàòó (ñàõàðîçè), òàê ³ äî âàaeêèõ ìåòàë³â.  ðî-áîò³ âñòàíîâëåíî îïòèìàëüíèé ÷àñ ³íêóáàö³¿ á³îñåíñîðà â ðîç÷èí³ òîêñèí³â äëÿ îòðèìàííÿ íåîáõ³äíî¿ ÷óòëèâîñò³, ÿêèé ñòàíîâèâ 30 õâèëèí. Îòðèìàíî êàë³áðóâàëüí³ êðèâ³ äëÿ âèçíà-÷åííÿ ð³çíèõ ³îí³â âàaeêèõ ìåòàë³â êîíäóêòîìåòðè÷íèì á³îñåíñîðîì òà ïåðåâ³ðåíî éîãî ñå-ëåêòèâí³ñòü ùîäî ³íøèõ ãðóï òîêñèí³â. Ðîçðîáëåíèé á³îñåíñîð õàðàêòåðèçóºòüñÿ á³ëüøîþ ÷óòëèâ³ñòþ òà ñåëåêòèâí³ñòþ äî ³îí³â Hg 2+ òà Ag + ó ïîð³âíÿíí³ ç â³äîìèìè íà äàíèé ìîìåíò á³îñåíñîðàìè äëÿ àíàë³çó âàaeêèõ ìåòàë³â ³ ìîaeå áóòè ðåêîìåíäîâàíèé ïðè åêñïðåñ-àíàë³ç³ ðåàëüíèõ çðàçê³â â åêîëîã³÷íîìó ìîí³òîðèíãó.Êëþ÷îâ³ ñëîâà: êîíäóêòîìåòðè÷íèé á³îñåíñîð, ³íã³á³òîðíèé àíàë³ç, ³íâåðòàçà, ìóòàðîòà-çà, ãëþêîçîîêñèäàçà, âàaeê³ ìåòàëè The data on development of highly sensitive and selective conductometric biosensor for determination of heavy metal ions are presented. A differential pair of gold planar thin-film interdigitated electrodes deposited on the ceramic substrate was used as a conductometric transducer. As a bioselective element, the three-enzyme system (invertase, mutarotase, glucose oxidase) immobilized on the transducer surface was more sensitive and selective to heavy metal ions as compared with other enzymatic systems due to summary inhibition effect of three enzymes. The enzymes ratio in mem-