The interception effect of heavy metals in different types of Chinese fir plantations

Soil contamination and human health: recent contributions

“…Two papers in this Special Issue are concerned with the sixth topic, forest soils: Yang et al (2020) investigated the interception effect of potentially toxic elements (PTE) such as Zn, Cu, Pb, As and Cd in different ages of Chinese fire pure plantations and mixed coniferous and broadleaved forest stand in Huitong country, Hunan Province, Southern China. Results showed that annual interception of PHE in the mixed stand was greater than in the pure Chinese fir stands.…”

Heavy Metal Content and Health Risk Assessment of Some Commercial Foods in Jiaozuo City

“…Nemerow comprehensive index method is one of the commonly used methods to evaluate the comprehensive pollution degree of various pollutants, and the formula is as follows [12]:…”

“…(2) Sample digestion [9]: For grain and bean samples, weigh 0.25g (accurate to 0.001g) into a polytetrafluoroethylene (PTFE) digestion tank, add 6mL nitric acid (MOS grade), cover and place for 1h, and then put it into a graphite digester for digestion; For vegetable samples, weigh 0.1g (accurate to 0.001g) of solid samples into a PTFE digestion tank, add 6mL of nitric acid (MOS grade) and 1.5mL of hydrofluoric acid (EP grade), pre-digest at 100 ℃ for one hour on the graphite digester, and then cover to continue digestion. The digestion temperature procedure is as follows: 120 ℃ digestion for 0.5h, 150 ℃ digestion for 10min, 180 ℃ digestion for 0.5h, after digestion to clear, set the temperature to 140 ℃, drive the acid to about 1 mL of colorless or light yellow clear liquid, stop, transfer the digestion solution to a 25ml centrifuge tube (PP material), wash the digestion tank with deionized water 2-3 times, and the washed liquid is also transferred into the centrifuge tube, and finally use deionized water to volume, use 0.45 μm PTFE needle filter is filtered, and then tested on the machine.…”