Overview
Total chromium represents the sum concentration of all chromium species present in a material or environment. In industrial and environmental contexts, distinguishing between chromium(III) (trivalent) and chromium(VI) (hexavalent) forms is crucial due to their markedly different toxicological profiles. While chromium(III) is an essential nutrient, chromium(VI) is a known carcinogen. Chromium occurs naturally in minerals like chromite and is extensively used in metallurgy, particularly for stainless steel production. The measurement of total chromium is fundamental for regulatory compliance in wastewater treatment, occupational safety, and product quality control across multiple industries.
Physical and Chemical Properties
Elemental chromium is a hard, lustrous transition metal with excellent corrosion resistance. Its compounds exhibit variable oxidation states, with Cr(III) and Cr(VI) being the most environmentally and industrially significant. Cr(III) forms stable complexes and is relatively insoluble in water, while Cr(VI) compounds are typically more soluble and mobile in environmental systems. The redox chemistry between Cr(III) and Cr(VI) is pH-dependent, with Cr(VI) being more stable under alkaline conditions. This property is exploited in industrial processes but also necessitates careful environmental monitoring. Analytical methods for total chromium determination include atomic absorption spectroscopy (AAS) and inductively coupled plasma (ICP) techniques.
Main Applications
The primary use of chromium is in metallurgy, where it imparts corrosion resistance and hardness to alloys. Stainless steel contains 10.5-30% chromium. Electroplating applications utilize chromium for decorative and hard coatings on automotive parts and household fixtures. In chemical manufacturing, chromium compounds serve as catalysts, pigments (chrome yellows and greens), and wood preservatives (chromated copper arsenate). The leather industry employs chromium(III) salts in tanning processes. Environmental applications include the measurement of total chromium in wastewater discharge monitoring to ensure compliance with regulations like EPA's Clean Water Act.
Safety and Storage
Chromium(VI) compounds require stringent safety measures due to their carcinogenicity and ability to cause dermal sensitization. OSHA's permissible exposure limit (PEL) for Cr(VI) is 5 μg/m³ as an 8-hour time-weighted average. Proper engineering controls (ventilation) and PPE (respirators, gloves) are mandatory in workplaces handling hexavalent chromium. Storage of chromium compounds should prevent contamination and accidental mixing with incompatible substances. Elemental chromium powder is flammable and should be kept away from oxidizers. Waste containing Cr(VI) typically requires special disposal procedures, often involving reduction to Cr(III) prior to treatment.
B2B Procurement Guide
When procuring chromium materials, clearly specify whether you require the metal, Cr(III), or Cr(VI) compounds. For regulatory compliance, request SDS documentation and certificates of analysis indicating speciation where applicable. Consider suppliers who provide batch-specific testing reports. For environmental testing services, verify the laboratory's accreditation for EPA methods like 218.6 (hexavalent chromium) or 200.7/200.8 (total chromium). Pricing varies by form and purity - ferrochromium for steelmaking trades in bulk quantities, while high-purity chromium chemicals command premium prices. Establish long-term contracts with reputable suppliers to mitigate price volatility in this commodity market.
Related Manufacturers
- 主营：水质检测仪、多参数水质检测仪、便携式水质检测仪器、总磷总氮测定仪、水质测定仪、水质分析仪、氨氮检测仪、电导率检测仪、实验室污水检测仪器、多参数水质测定仪、多参数水质分析仪、便携式溶解氧检测测定仪、悬浮物检测仪、便携式多参数水质检测仪、便携式多参数水质分析仪、COD快速检测仪、cod测定仪、余氯检测分析仪、浊度检测仪、红外测油仪、BOD测定仪、饮用水水质检测仪、水质在线监测仪、蓝绿藻叶绿素测定仪、水质检测箱
- 主营：水质检测仪、高锰酸盐指数检测仪、cod检测仪、总磷检测仪、总氮检测仪、菌落总数检测仪、氨氮检测仪、浊度检测仪、悬浮物检测仪、溶解氧检测仪、电导率检测仪、PH检测仪、色度检测仪、TOC检测仪、BOD检测仪、红外测油仪、紫外多参数检测仪、水质重金属检测仪、水中油检测仪、TDS检测仪、溶解氧在线检测仪、PH在线检测仪、浊度在线检测仪、余氯在线检测仪、大肠杆菌检测仪
- 主营：工业污水在线、在线水质检测仪、在线水质监测仪、总铬检测仪、在线气体检测仪、便携式水质检测仪、实验室水质检测仪、水质分析仪、电极法水质检测仪
- 主营：总铬水质自动监测、水质在线监测
- 主营：水质测定仪、浊度检测仪、色度检测仪、总氯检测仪、COD氨氮总磷总氮测定仪、总磷检测仪、总氮检测仪、COD测定仪、便携式水质测定仪、多参数水质分析仪、悬浮物检测仪、二氧化氯检测仪、高锰酸盐指数检测仪、污水检测仪器、溶解氧测定仪、BOD测定仪、余氯测定仪、氨氮检测仪、水质叶绿素a检测仪、ph检测仪、蓝绿藻检测仪、红外测油仪、电导率检测仪、水质重金属检测仪、多参数水质检测仪
- 主营：复合碳源、液体除磷剂、工业废水净化、金属总量快检包、污水处理混凝剂
- 主营：多参数水质检测仪、COD测定仪、氨氮测定仪、总氮测定仪、总磷测定仪、红外测油仪、便携式红外测油仪、便携式多参数水质检测仪、BOD测定仪、密封性测试仪、生物毒性检测仪、水质分析仪、包装密封性检测仪、测油仪、COD氨氮检测仪、水中叶绿素a测定仪、余氯检测仪、硅酸根分析仪、水中油检测仪、水质重金属检测仪、浊度检测仪、BOD快速测定仪、程控定量封口机、水质微生物检测仪、溶解氧检测仪
- 主营：比浊仪、检测仪、测定仪、总氮分析仪、测油仪、氧分析仪、光光度计、液萃取仪、指数分析仪、辐射剂量仪、凝胶成像仪、流速流量计、在线分析仪、回流消解仪、气体分析仪、水质分析仪、明渠流量计、在线监测仪、吸收光谱仪、发光成像系统、便携式露点仪、一体化蒸馏仪、水质观测系统、手持式浊度仪、在线监测系统
- 主营：气体检测仪、水质检测仪、自动水质采样器、总铬在线监测仪、测距仪、大气采样器、恒温恒湿称重系统、油气回收检测仪、风速仪、声级计、尘埃粒子计数器、湿球黑球温度指数仪、温湿度测试仪、烟尘烟气测试仪、红外测温仪、空气微生物采样器、VOC气体检测仪、可燃气体浓度检测仪、全自动菌落计数器
- 主营：水质检测仪
- 主营：检测仪、voc测试仪、油烟测试仪、总铬在线监测仪、自动监测仪、油烟分析仪、油烟监测仪、大气采样器、气体检测仪、水质分析仪、烟气分析仪、明渠流量计、水质采样器、环境检测仪
- 主营：击实仪、筛析仪、检测仪、重金属总铬离子比色管、测试仪、探钎机、集装箱、试验机、测定仪、试验仪、阻力仪、振摆仪、大于40cm、uv紫外线、防水材料、水泥浆体、石材耐磨、电线电缆、塑料哑铃、水泥标准、砖石水泥、狄法尔磨、电动脱模、稳定度仪、压力泌水、胶砂流动
- 主营：黑度仪、场强仪、检测仪、总铬在线自动监测仪、风速仪、检测箱、外置泵、电磁兼容、自动采样器、流速监测仪、紫外辐照仪、水质监测仪、黑烟识别器、黑球指数仪、水质采样器、水质速测箱、风速测量仪、甲醛测试仪、明渠流量计、孔口流量计、微电脑控制器、电磁场测量仪、微生物采样器、手持式抓拍仪、恒温恒湿设备、气溶胶采样器
- 主营：COD检测仪、COD消解器、COD加热器、总磷检测仪、总氮检测仪、BOD测定仪、红外测油仪、水质采样器、氨氮检测仪、多参数水质分析仪、粉尘仪、林格曼黑度图、COD恒温加热器、恒温恒湿称重系统、微波消解仪、水质硫化物酸化吹气仪、蒸馏仪、萃取器、溶解氧测定仪、明渠流量计、COD测定仪、红外分光测油仪、COD消解回流仪、液液萃取器、BOD检测仪
- 主营：培养箱、分析仪、检测仪、总铬在线监测仪、报警仪、测量仪、酸度计、风速仪、蓝牙、称重系统、室内检测仪器、甲醛检测、测定仪、声校准器、酸碱浓度计、流量计、采样器、消解器、机器人、振动检测分析仪、测试仪、环保第三方检测、环境检测、综合采样器、生物安全柜、浊度仪