Bridging performance of new eco-friendly lost circulation materials

Alireza NASIRI,Ahmadreza GHAFFARKHAH,Zahra Azimi DIJVEJIN,Masood MOSTOFI,Mostafa Keshavarz MORAVEJI

Table 3 Mass concentration of heavy metals in RIPI-LQ, RIA-X, RIA-G and IFV-Red.

Additive name Pb content/ (mg·kg-1) Cd content/ (mg·kg-1) Cu content/ (mg·kg-1) Zn content/ (mg·kg-1) Cr content/ (mg·kg-1) As content/ (mg·kg-1) RIPI-LQ 0.122 0.046 26.784 86.374 0.021 0.298 RIA-X 0.001 0.062 6.709 91.265 0.039 0.321 RIA-G 0.017 0.029 57.163 72.239 0.022 0.412 IFV-Red 0.084 0.076 9.912 55.321 0.018 0.356 Acceptable level by world health organization (WHO) 0.300 0.100 73.000 100.000 0.050 0.430