Perchlorate is a kind of salt containing perchlorate, which can be divided into two sources: natural generation and human synthesis. Natural perchlorate is often used as raw material of chemical fertilizer, and perchlorate can also be produced in the atmosphere; synthetic perchlorate is widely used in leather processing, rubber manufacturing, coating production, lubricating oil additives and other fields, and is also one of the main components of solid rocket propellant.
1.The harm of perchlorate
Perchlorate has the same charge and ion radius as iodine ion, and has a higher affinity for the transport protein of iodine ion than iodine, so it can inhibit the absorption of iodine, affect the thyroid function, interfere with the normal metabolism of human beings, and affect the normal growth and development of fetal and infant nerve center.
Perchlorate causes insufficient secretion of thyroxine, interferes with the normal function of thyroxine related cytokines, causes changes in nerve structure, and then causes disorders in behavior, language, intelligence and other aspects of patients. Perchlorate may also promote carcinogenesis and lead to reproductive dysfunction in animals.
The pollution of perchlorate mainly comes from the mass production and use of human beings. Perchlorate is stable and can exist for decades in normal environment. Perchlorate can pollute water, soil, biology and food, and its solubility is high. Once it enters the environmental medium, it will spread rapidly with the groundwater and surface water, thus causing the expansion of pollution.
When perchlorate in the environment enters into the food chain through the ecosystem and accumulates step by step, it will pose a threat to agricultural products and food safety. For example, perchlorate will be detected in milk and beef after cattle eat grass rich in perchlorate. In fact, perchlorate pollution is common in groundwater, drinking water, meat products, grains, fruits and vegetables, beverages and other foods. Perchlorate can be transmitted to human beings through water source irrigation, bioaccumulation and so on.
In the late 1990s, the United States Environmental Protection Agency found perchlorate in drinking water in many places. In 1997, perchlorate with a concentration of 260 μg/L (μg/L) was detected in a drinking water source in California, USA. since then, perchlorate has been detected in surface water and groundwater in Nevada, Utah and Texas. Perchlorate has been detected in tomatoes, spinach, lettuce, carrots and seafood in almost all monitoring sites in the United States.
In April 2009, researchers from the Centers for Disease Control and prevention reported that baby milk powder was contaminated with perchlorate, which attracted great attention. In 2014, according to the inhibition test of thyroid iodine uptake rate of normal adults, the European Food Safety Administration formul.
2.Detection of perchlorate
At present, the determination methods of perchlorate include ion chromatography, ICP-MS and so on. Ion chromatography conductance detection can be used to determine trace perchlorate ions in environment, food and water. The new CIC-D150 ion chromatograph with SH-AP-1 column can detect the trace perchlorate in environment, food and water.
Instrument : CIC-D150
Column : SH-AP-1 (4.0 * 250)mm,peek
Flow rate: 1mL / min
Eluent: 35mmol / mL NaOH
Column temperature: 35℃
Suppressor: SHY-A-6
Suppressor current: 105mA
Conductivity cell : SHD-6
Conductivity cell temperature: 35℃
Quantitative loop: 1000uL
Spectrogram:
D series ion chromatograph are stable and reliable, easy to operate,which are the right assistant for quality control and detection! CIC-D150 ion chromatograph is located in the intelligentization, which realizes the functions of remote control by mobile phone APP, timed startup and preheating, real-time display of instrument parameters and operation status on intelligent large screen, one-key intelligent maintenance, etc. it is more convenient to use and greatly improves the productivity and user experience of the laboratory.
D150 has high precision and reliable analysis ability, so it is easy to realize the simultaneous determination of 100ppb-100ppm concentration samples without setting the measuring range. It is also easy to set up a micro gas-liquid separator to separate the bubbles in the eluent.
