Total nitrogen (N) was quantified by adopting the semi-micro-Kjeldahl process. Total phosphorus (P) was measured using iCAP 6300 inductively coupled plasma spectrometers (Thermo Science, Wilmington, United States). Total calcium (Ca) and magnesium (Mg) were measured in ICP Optima 8000 (Perkin-Elmer, Waltham, MA, United States). Information on soil properties can be found in Supplementary Table 1 .
Icp optima 8000
Manufactured by PerkinElmer
Sourced in United States
The ICP Optima 8000 is an inductively coupled plasma optical emission spectrometer (ICP-OES) designed for elemental analysis. It utilizes a plasma source to atomize and ionize samples, and an optical system to detect and measure the specific wavelengths of light emitted by the excited elements. The ICP Optima 8000 is capable of analyzing a wide range of elements in various matrices.
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3 protocols using icp optima 8000
1
Comprehensive Soil Nutrient Analysis
2
Comprehensive Soil Physicochemical Analysis
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A total of 17 soil physicochemical properties were measured. Briefly, soil water content was determined gravimetrically (75 (link)). Soil NO3− and NH4+ concentrations were measured after the samples were extracted with 2 mol/liter KCl by using a San++ continuous flow analyzer (Skalar, Breda, Netherlands). Soil salinity and pH were measured by using an FE20 digital meter (Mettler Toledo, Shanghai, China). Soil TC and total nitrogen (TN) were determined by using a 2400 II CHN elemental analyzer (PerkinElmer, Waltham, MA, USA), and then the carbon/nitrogen (C/N) ratio was calculated. Other soil elements (including P, K, Ca, Mg, Mn, Al, Fe, and Cu) were digested with 1:2:1 (vol/vol/vol) nitric acid (HNO3), hydrofluoric acid (HF), and perchloric acid (HClO4) on a hot plate and then determined by using an ICP Optima 8000 (PerkinElmer).
3
Trace Element Analysis of Plastisphere
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After being oven dried at 50°C, the samples were homogenized and sieved through a 2 mm mesh screen. To determine total trace elements, 0.5 g of plastisphere and 0.5 g of sediment samples were digested completely with a mixture of concentrated solutions of HF, HClO 4 and HNO 3 , as described by Mudroch et al. (1996) . The nal solution was diluted to 100 mL in volume. The concentrations of Cd, Co, Cu, Cr, Ni, Pb and Zn were determined using ICP-OES (Perkin Elmer ICP optima 8000). The ICP-OES was calibrated using multi-element calibration standard (Perkin Elmer). The two certi ed reference materials, BCR-32 (Natural Moroccan Phosphate Rock: Phosphorite) and BCR 414 (plankton) were used to estimate the recovery of the method. The measured recovery rates were between 91.50% and 101.90% for the BCR 32 and between 93.07% and 106.29% for the BCR 414. Each sample was analysed 3 times to verify the accuracy of the instrument. The relative standard deviation of the three replicates was calculated. For all elements the RSDs were between 0.16% and 4.9% (Table 1).
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