Diantara pencemar yang umun mencemari peraira ialah logam berat seperti tembaga (Cu), kromium (Cr), timbal (Pb), cadmium (Cd), dan nikel (Ni). Sedangkan air sendiri merupakan suatu sumber daya alam yang teramat penting dalam kehidupan hamper semua organisme. Salah satu ekosistem yang kerap kali tercemar ialah ekosistem perairan. Adanya industri juga turut menyumbang limbah berupa zat pencemar yang apabila dibiarkan, akan mencemari ekosistem dan membahayakan makhluk hidup yang tinggal di lingkungan tersebut. Diantara kegiatan industri yang dilakukan di Indonesia ialah industri tambang, pupuk kimia, tekstil, dan elektroplating. PENDAHULUAN Salah satu upaya yang dilakukan oleh negara berkembang seperti Indonesia agar bisa meningkatkan perekonomian negara ialah dengan memperbanyak industri. This is due to the fact that at this concentration, the Sagittaria lancifolia plant presents indications of death, particularly severe chlorosis and necrosis. According to the result of this research, the plant Sagittaria lancifolia may remediate heavy metal Cu at a maximum concentration of 5 mg/L. This study employed an experimental technique, which was carried out between March 26 and April 7, 2021, in the Purwodadi Botanic Garden's Greenhouse, with four concentration variations, namely 0 mg/L, 1 mg/L, 3 mg/L, and 5 mg/L. This research is a preliminary study into the limitations of the Sagittaria lancifolia plant's capacity to absorb heavy metal Cu. Phytoremediation approaches using Sagittaria lancifolia plants are thought to be capable of overcoming heavy metal Cu contamination in the environment. Phytoremediation is one of the ecologically acceptable pollutant treatment methods. However, the existence of industry has a detrimental consequence, one of which is heavy metal copper pollution (Cu). One of Indonesia's strategies to improve the quality of its economy as a developing country is to boost industrial activity. mucronata also found greater content of Cu heavy metals than Pb. The results showed heavy metal content of Cu was greater than Pb in wire roots, stems and leaves of A. mucronata that grew in Muara Sungai coastal areas from April to August 2018. The mangrove species used for the analysis of Cu and Pb heavy metals were A.marina and R. Analysis of Cu and Pb heavy metals contents were carried out at the Chemistry Laboratory of the USU Medan Pharmacy Faculty. How big is the ability of Avicenia marina and Rhizopohora mucronata mangroves to absorb copper (Cu) and Lead (Pb) metals and how the conditions of the aquatic environment surrounding mangroves during heavy metal stress are need to be studied. The presence of heavy metals will reduce water quality subsequently will decline the overall condition of the ecosystem. These species are also act as indicator of the sustainability of mangrove ecosystems. Avicennia marina and Rhizophora mucronata are pioneer mangrove species that are able to accumulate heavy metals in the roots, stems and leaves. Most species of mangroves such as Avicennia marina, Rhizophora mucronata, Sonneratia caseolaris, Bruguiera gymnorhyza and others apply this strategy. One of the several strategies used by mangroves is by accumulating various kinds of heavy metals in various parts of the tree. Various types of mangrove plants found in coastal areas have a specific strategy to deal with pollution conditions from heavy metals.
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