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STUDY ON ADSORPTION OF HEAVY METALS BY RICE HUSK

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Overview

This source page is a mechanical bulk-ingest record for a PDF in the research-pulls corpus. It preserves source-level identity, routeable product/analyte scope, and exact extracted numeric lines for later human or fresh-context audit. It does not derive HMTc thresholds, percentiles, or brand-by-brand comparisons.

Key numbers

The worker extracted the full PDF text with layout preservation twice and compared extraction hashes before commit. The following lines are copied from numeric/table-bearing regions of the PDF and retain the source units and wording where legible:

  • pollution by heavy metals have been frequently (4) are evaluated and the results are shown in Table
  • confirmed in former factory sites. The purification 1. From Table 1, it can be seen that few alkali
  • once opened, the mine drainage continues to flow Table 1 The cost and the ability for each alkaline
  • treatment is suitable as a simple treatment method aqueous solution (Kobayashi et al.(8)). In addition,
  • First, seven initial concentrations (3 ppm, 4 ppm, Freundlich: log Wi = log K F + log Ci (3)
  • the mean value of 3 tests is adopted as a test result. shaking test. After that, the raw rice husks which
  • ensure reproducibility, the mean value of 3 tests is Fig.3 shows that the amount of Cd adsorbed in the
  • Table 4. as the concentration increases. It is confirmed that
  • 3.1 Heavy Metals Adsorption Test Results medium concentration range. Water molecules are
  • The adsorption isotherms obtained in the tests concentration range. As described in (13), liquid
  • Fig.4, more than 90% of Zn, about 60% of Cu, and Cd. According to Freundlich model, it is clarified
  • about 90% of Cd are extracted, which indicates that that the degree of adsorption ability of raw rice

Methods (brief)

  • the solutions are analyzed by an ICP-AES. The test recover heavy metals which are valuable resources
  • heavy metals. Langmuir and Freundlich models are analyzed by an ICP-AES. The difference between
  • the solutions is analyzed in an ICP-AES. In order to husks to Cd is likely to be monolayer adsorption.
  • Sample Rice nealy 1.0 g

Implications

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Verification notes

  • Identity check: DOI, raw handle, candidate cite-key, and SHA-256 were compared against existing the linked reference record pages before creation.
  • Full-PDF read: pdftotext -layout was run on the full PDF twice; extracted text hashes matched before the page was written.
  • Numeric verification: numeric/table-bearing lines were selected mechanically from the verified extraction and preserved without unit conversion or rounding.
  • Brand firewall: the worker skips PDFs when extracted numeric lines appear brand/manufacturer-sensitive; this page contains category-level or species-level evidence only.
  • HMTc firewall: no threshold, percentile, pass/fail, clean/dirty, or certification math is stated.

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