Urinary beryllium

There are more than 300 elements in nature, and more than 60 types can be detected by the human body. Among them, there are 11 kinds of macro elements necessary for the human body, and there are more than 50 kinds of trace elements with a weight of 0.1%. At present, there are 14 kinds of trace elements necessary for human body, but no urinary sputum. Therefore, trace element research has become one of the important foundations of frontier science such as biogeochemistry, inorganic biochemistry, molecular biology and life origin. Basic Information Specialist classification: urinary examination classification: urine / kidney function test Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: normal. Normal value: Urinary sputum: 0-5.55nmol/24h Above normal: 铍 poisoning (emergency, chronic). negative: Positive: Tips: The atomic absorption spectrophotometer and graphite furnace of different manufacturers may have different operating conditions, so the best operating conditions should be selected according to the instrument used. Normal value <5.55 nmol/24 h (<0.05 μg/24 h). Clinical significance Abnormal result Increase sputum poisoning (urgent, chronic). People who need to be tested A person with headache, fatigue, low fever, cough, difficulty breathing, and dull chest. High results may be diseases: precautions for poisoning 1. The atomic absorption spectrophotometer and graphite furnace of different manufacturers may have different operating conditions, so the best operating conditions should be selected according to the instrument used. 2. Add the matrix improver as soon as possible after the urine sample is collected. 3. In the field sampling and laboratory analysis, it is necessary to prevent the pollution of cockroaches. If the urine is taken during or after the shift, the worker should collect the urine sample after leaving the work site, changing the overalls and washing the hands. 4. Glassware and plastic utensils are soaked in 1:1 nitric acid overnight before use, rinsed with water, and dried for use. Inspection process 1. Sampling, transportation and storage: Collect urine samples in polyethylene plastic bottles, mix them, measure the specific gravity as soon as possible, then take 20ml urine sample into another plastic bottle, add 20ml matrix modifier and mix. It can be transported at room temperature and stored in the refrigerator (4 ° C) for at least 2 weeks. 2. Sample processing: The urine sample which has been added with the same amount of matrix modifier is thoroughly mixed and can be measured. 3. Standard curve: (1) Instrument operating conditions: Refer to the following instrument operating conditions to adjust the atomic absorption spectrophotometer to the best working condition. Wavelength: 234.9 nm spectral passband: 0.4 nm. Lamp current: 10 mA injection volume: 20 μl. Background correction: Zeeman effect or xenon lamp. Carrier gas flow rate: 3000ml/min, stop gas when atomized. Drying temperature / time: 80 ~ 120 ° C / 30s. Ashing temperature / time: 600 ~ 1500 ° C / 20s for 10s. Atomization temperature / time: 2600 ° C / 3 s. Cleaning temperature / time: 2800 ° C / 3 s. (2) Drawing of the standard curve: Take 2.00ml of normal human mixed urine and add 2.0ml matrix modifier as a blank control tube, then take 6 plugged test tubes and add 0.10, 0.20, 0.40, 0.80, 1.20, respectively. 2.00ml, supplemented with 2mg into the matrix modifier, and then added to the normal human mixed urine 2.00ml, the concentration of bismuth is 0.5, 1.0, 2.0, 4.0, 6.0, 10.0μg / L, and mixed. The absorbance values ​​of the blank control tube and each of the above tubes were measured according to the operating conditions of the instrument. The absorbance value of the blank control tube is subtracted from the measured absorbance value to be the ordinate, and the 铍 concentration is plotted on the abscissa, and a standard curve is drawn. 4. Sample measurement: directly measure the sample tube according to the operating conditions of the instrument, subtract the absorbance value of the blank control tube from the measured absorbance value, and check the concentration of strontium in the urine from the standard curve. Not suitable for the crowd no. Adverse reactions and risks no.