chemlec - nature of anachem

• chemical tests are reagents added to the sample to determint the composition
• flame tests detect the presence of certain elements, primarily metal ions, based on each element's characteristic emission spectrum
• gravimetric method determines the mass of the analyte or some compound chemically related to it.
• volumetric method is the volume of a solution of a known concentration, containing sufficient reagent to react completely with the analyte is measured
• instrumentation method is with the use of scientific instruments
• electroanalytical method is the study of an analyte by measuring potential current in an electrochemical cell containing the analyte
• spectroscopic method is based on the measurement of the interaction between electromagnetic radiation and analyte atoms or molecules
• UV-VIS Spectrophotometry measures the concentration of solution by the amount of light absorbed by the substance across UV-Visible ranges of the electromagnetic spectrum.
• Interferences is a species that causes error by enhancing or attenuating the quantity being measured.
• Qualitative is the determination of the chemical species
• quantitative is the determination of the relative amount of the chemical specie in each amount of the sample
• macro analysis is the amount of analyte more than 0.10 grams
• semimicro analysis is the amount of analyte between 0.010-0.10 grams
• micro analysis is when the amount of analyte is 10-4 to 10-2 grams
• ultramicro analysis is the amount of analyte less than 10-4 grams
• ultramicro analysis is the determination of arsenic, boron, nickel, or silicon in the body through the urine test
• micro analysis is the determination of creatinine in a urine sample
• sampling is the process of collecting a small mass of a material whose composition accurately represents the bulk of the material being sampled
• sampling is the most difficult aspect of analysis
• real samples is the analysis of real samples because of the presence of sample matrix
• gross samples are these representative samples that are collected from the source
• laboratory samples are samples that are reduced in size and being homogenized so that they are measurable in the lab
• applications of analytical chemistry include medicine, industry, environment, food, forensic, biochemistry, pharmaceutical science
• analytical chemists use science and technology to solve practical problems
• Analytical chemists work to improve the reliability of existing techniques to meet the demands of for better chemical measurements which ariseconstantly in our society.
• Analytical chemists adapt proven methodologies to new kinds of materials or to answer new questions about their composition.
• Analytical chemists carry out research todiscover completely new principles ofmeasurements and are at the forefront of theutilization of major discoveries such as medicaldevices for practical purposes.