NOVELTY - Determination of heavy metal comprises pretreating waste compost comprising tall fescue, modified nanocarbon, and artificial rainwater, removing debris, drying, sieving, performing leaching experiment, spreading barrier material, placing compost on top of barrier material, adding tall fescue, adding water, composting, adding sawdust and modified nanocarbon, processing, sowing tall fescue seed, dissolving in distilled water, applying onto surface of compost, mowing, drying, sealing, collecting leachate, pouring artificial rain, and collecting filtrate.    USE - Method for determining heavy metal using modified nanocarbon combined with grass and chelating agent enriched compost (claimed).    DETAILED DESCRIPTION - Determination of heavy metal using modified nanocarbon combined with grass and chelating agent enriched compost comprises pretreating waste compost comprising tall fescue, modified nanocarbon with particle size of 20-70 nm and specific surface area of 1.2x 105 m2\kg at pH 7, and artificial rainwater at pH 4.40, removing debris, drying, sieving over 2 mm mesh, performing leaching experiment indoor using interlayer material comprising 63 g sand with height of 25 cm and PVC pipe with diameter of 3 cm and height of 3 cm, spreading barrier material on top of sand at height of 5 cm, placing 70 g compost on top of barrier material at height of 8 cm, adding 0.3 g tall fescue on top, adding water to obtain compost mixture with moisture content of 60%, composting indoor at 16-22 degrees C and relative humidity of 36-57%, adding 9.5 g sawdust and 5.12 g modified nanocarbon at height of 5 cm, processing using EDTA or diethylenetriamine pentaacetic acid (DTPA), sowing tall fescue seed for 30 days, dissolving EDTA and DTPA in distilled water to obtain 10 mmol/g EDTA and 10 mmol/g DTPA, applying onto surface of compost at 10 mL dosage, mowing for 10 days at 1 cm stubble, drying in oven to constant weight at 80 degrees C, sealing lower end of PVC pipe with layer of cotton and nylon mesh, collecting leachate after administration of EDTA and DTPA on days 9, 16, 23 and 30, pouring slowly artificial rain, and collecting filtrate using TAS-990 atomic absorption to determine heavy metals. The modified nanocarbon comprising is prepared by modifying using potassium permanganate, sulfuric acid and nitric acid. The artificial rainwater comprises 1.94 mg/L nitrate anion, 0.49 mg/L ammonia cation, 1.87 mg/L sodium cation, 0.25 mg/L magnesium cation, 0.29 mg/L calcium cation, 3.41 mg/L chloride anion and 2.65 mg/L sulfate anion.