It was employed for stringcourses, parapets, ashlars on angular ends of the bastions and other minor elements, as well as for building some of the gates (Porta Savonarola, Porta San Giovanni, Porta Santa Croce, and Porta Liviana-Pontecorvo).
Minor elements as potassium and chloride could derive from plant material suggesting the use of wood charcoal as the black pigment [13].
SEM EDS analysis of the black layer revealed the presence of calcium, sulfur and silicon, together with minor elements as aluminium, potassium, iron and copper (Table 1).
Gopinathpur seam coals have high concentrations of K (1189.5 5573 ppm; av 2650.7 ppm) and Na (4534 5618 ppm; av 5314.7 ppm) among the minor elements as compared to the world average in coals as given by Valkovic (1983).
(2) Gopinathpur seam coals have high concentrations of K (1189.5 5573 ppm) and Na (4534 5618 ppm) among the minor elements as compared to the world average in coals.
Elements of interest included major elements such as calcium and magnesium; minor elements such as mercury, iron, and zinc; and trace elements such as lead, arsenic, cadmium, chromium, and copper.
The solution is composed of different fertilizer-grade chemical compounds containing varying amounts of nitrogen, phosphorus, and potassium the major elements necessary for plant growth and various trace, or minor, elements such as sulfur, magnesium, and calcium.
In addition to the major elements (H, C, N, O), minor elements such as Na, Mg, P, S, Cl, K, Ca and Fe present in body tissues also interact in neutron collisions.
The minor elements such as Ca, K and Na have shown removal of 22.88 %, 31.96 % and 50.43 %, respectively.
Water-rock interactions generate gases (CH4, H2, H2S), whereas, major and minor elements such as Fe, Mn, Ca, Li, K, Na, Cl, Si are exchanged between rocks and water.
(6) When coal sample (GT-1) from Gopinathpur top seam, was treated with 10 mg/mL of bacterial biomass, the minor elements such as Ca, K and Na have shown removal of 22.88 %, 31.96 % and 50.43 %, respectively and the trace elements like Ni and Zn have shown a high removal of 84.06 % and 61.29 %, respectively.
