Воздействие La(Ш), Cu(II) и их комбинации на одноклеточную водоросль Scenedesmus quadricauda (Turp.) Breb
Аннотация
Металлы попадают в окружающую среду совместно. Целью представленной работы была оценка воздействия La(Ш), Cu(II) и их комбинации (1:1) на одноклеточную водоросль Scenedesmus quadricauda (Turp.) Breb при низких концентрациях металлов в водной среде. В воду питьевого качества добавляли соли CuSO4·5H2O и La2(SO4)3·8H2O до достижения концентраций 0,000008‒0,0016 ммоль/л в расчете на ион металла или их сумму (1:1). Проводили биотестирование модельных растворов по методу учета численности клеток водорослей через 72 часа экспозиции. Действие Cu(II) имело слабый стимулирующий эффект: максимально численность клеток увеличилась в растворах с 0,0008 и 0,0016 ммоль/л металла (в 1,2 и 1,3 раза к контролю). La(III) во всем диапазоне тестируемых концентраций значительно стимулировал увеличение численности клеток водорослей (4,2‒11,1 раз). При совместном действии Cu(II) и La(III) гормезис имел среднюю степень по сравнению с эффектами металлов по отдельности (1,8‒2,9 раз к контролю). Таким образом, впервые показано, что витальные концентрации Cu(II), La(III) и их комбинаций в водной среде приводят к увеличению размножения зеленых водорослей, причем эффекты La(Ш) превышают эссенциальное действие Cu(II). Следовательно, даже незначительное поступление металлов в водные экосистемы может приводить к их эвтрофикации.
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