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<p>Ilmenite serves as a primary ore for extraction of titanium, an element of emerging interest in plant biology, where it is now known to serve as both fertilizer and toxin depending on dosage. This study sought to determine if the effects of exposure to ilmenite on plant growth differed from its smelted product titanium dioxide (TiOx), and if those effects vary with the particle size of the minerals. Common radishes (<i>Raphanus sativus</i>) were planted in substrate treated with either ilmenite or titanium dioxide to 4% of ssubstrate dry mass at varying particle size and allowed to grow. The dry mass, length, and chlorophyll activity of the plants were then measured and compared. Radishes exposed to either mineral displayed significantly stunted growth and signs of toxicity such as reduced mass and chlorophyll content. No differences in the impacts were found between the two minerals. The effects did not vary with ilmenite particle size, while issues with milling resulted in uniform titanium dioxide particle sizes. The toxic effects of ilmenite and TiOx on plant growth were not significantly different, indicating similar activity at the dosage used for this study. This finding warrants further research, investigating if ilmenite similarly duplicates low-dose beneficial effects of TiOx.</p>

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Effects of Particle Size on Ilmenite and TiO2 Toxicity to the Growth of Common Radish, Raphanus sativus

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Thomas A. Bryan,
  • Hejintao Huang,
  • Paul G. Wolf,
  • Lawana Adcock,
  • Yong Wang

摘要

Ilmenite serves as a primary ore for extraction of titanium, an element of emerging interest in plant biology, where it is now known to serve as both fertilizer and toxin depending on dosage. This study sought to determine if the effects of exposure to ilmenite on plant growth differed from its smelted product titanium dioxide (TiOx), and if those effects vary with the particle size of the minerals. Common radishes (Raphanus sativus) were planted in substrate treated with either ilmenite or titanium dioxide to 4% of ssubstrate dry mass at varying particle size and allowed to grow. The dry mass, length, and chlorophyll activity of the plants were then measured and compared. Radishes exposed to either mineral displayed significantly stunted growth and signs of toxicity such as reduced mass and chlorophyll content. No differences in the impacts were found between the two minerals. The effects did not vary with ilmenite particle size, while issues with milling resulted in uniform titanium dioxide particle sizes. The toxic effects of ilmenite and TiOx on plant growth were not significantly different, indicating similar activity at the dosage used for this study. This finding warrants further research, investigating if ilmenite similarly duplicates low-dose beneficial effects of TiOx.