1. College of Natural Resources and Environment, Northwest A&F Univ., Key Laboratory of Plant Nutrition and Agro‐environment in Northwest China Ministry of Agriculture Yangling Shaanxi 712100 China
2. College of Metallurgy and Environment Central South Univ. Changsha Hunan 410083 China
3. Global Centre for Environmental Remediation, College of Engineering, Science and Environment Univ. of Newcastle Callaghan NSW 2308 Australia