QA QC ADDITIONAL TERMS

Grab sample

A single sample of water collected at a particular time and place that represents the composition of the water only at that time and place.

Random sampling

A sample resulting from a sampling plan that can be expected to adequately reflect

the properties of interest of the parent populatio

Selective sample

A sample that is deliberately chosen by using a sampling plan that screens out

materials with certain characteristics and/or selects only material with other relevant

characteristics

Stratified sample

A sample consisting of portions obtained from identified subparts (strata) of the

parent population. Within each stratum, the samples are taken randomly

Convenience sample

A sample chosen on the basis of accessibility, expediency, cost, efficiency, or other

reason not directly concerned with sampling parameters

Umpire or referee or reserve sample

A sample taken, prepared, and stored in an agreed upon manner for the purpose of

settling dispute

Replicate (duplicate) sample

Multiple (or two) samples taken under comparable conditions. This selection may be

accomplished by taking units adjacent in time or space.

Sequential sample

Units, increments, or samples taken one at a time or in successive predetermined groups, until the cumulative result of their measurements assessed against predetermined limits, permits a decision to accept or reject the population or to

continue sampling

Multistage sample

Sample taken in a series of steps with the sampling portions being selected from the

larger or greater number of portions of the previous step

Combined sample

A sample obtained by removing specific fractions by separation or selection techniques (heavy liquid, magnetic, sieving, etc.), analyzing the fractions separately, and combining the results mathematically.

Modified sample

A sample or a known fraction of the parent population in which the analyte has been

isolated or (usually) concentrated before being submitted to the laboratory

Increment

An individual portion of material collected by a single operation of a sampling device.

Usually taken from parts of a lot separated in time or space

Primary sample

The collection of one or more increments or units initially taken from a population

- The portions may be either combined (composited or bulked sample) or kept separate

(gross sample).

Reduced sample

- A representative part of the primary (composite or gross) sample obtained by a

division and reduction process

Subsample

- Portion of the sample obtained by selection or division

- Individual unit of the lot taken as part of the sample

- The final unit of multistage sampling

Laboratory sample

The sample or subsample sent to or received by the laboratory

Test sample/analytical sample

- The sample, prepared from the laboratory sample, from which test portions are

removed for testing or for analysis

Test portion/analytical portions

- The quantity of material, of proper size for measurement of the concentration or

other property of interest, removed from the test sample.

Test solution/analytical solution

- Solution prepared by dissolving, with or without reaction, the test portion in a liquid

Treated solution

The test solution that has been subjected to reaction or separation procedures prior to measurement of some property.

Aliquot

A known amount of a homogeneous material, assumed to be taken with negligible

sampling error.

Sodium chloride, NaCl

What is the primary standard for Titration of silver nitrate?

Sodium carbonate, Na2CO3

What is the primary standard for titration of acids?

Potassium hydrogen phthalate (KHP), KHC8H4O2

What is the primary standard for Titration of bases, perchloric acid and aqueous base in an acetic solution

Potassium dichromate, K2Cr2O7

What is the primary standard for redox reaction?

Zinc powder (in HCl or H2SO4)

What is the primary standard for Standardization of EDTA solution?

Globally Harmonized System (GHS)

Presents the guidelines proper labelling, storage and manegement of chemical waste; pursuant to the Republic Act No. 6969, DAO 2015-09

Safety Data Sheet

technical documents that contain all the information related to the health effects upon exposure, hazard and storage handling, precautionary measures and emergency procedures

True

An SDS can be an MSDS but an MSDS is not an SDS

pH<= 2

What should be the pH of a waste for it to be considered as an acidic waste

ph=> 12.5

What should be the pH of a waste for it to be considered as an alkali waste?

waste generator

Refers to a person who produces hazardous wastes, through any institutional, commercial, industrial or trade activities

wastes with inorganic materials

Wastes containing mercury and arsenic should be classified as _____

Rubber gloves

In handling acid wastes, what type of protective gloves should be used?

Polyethylene Drums

What type of container must be used for acid or alkali wastes

sodium bicarbonate

In case of acid spils, what can be applied to the spill before treatinf it with adsorbent material

Ignitability

Hazardous waste characteristic which applies to waste liquids with a flash point less than 140 F

Corrosivity

Hazardous waste characteristic which applies to aqueous solution with a pH less than or equal to 2 or greater than or equal to 12.5

Reactivity

Hazardous waste characteristic which applies to materials that are normally unstable or explosive

Toxicity

Hazardous waste characteristic which applies to wastes that have the potential to contaminate groundwater if improperly disposed

Composting

Solid waste management practice which refers to the controlled decomposition of organic matter by microorganisms, mainly bacteria and fungi, into a humus-like product

Compostable wastes

Biodegradable wastes such as food waste, garden waste, animal waste and human waste that undergo biological degredation under controlled conditions

Persistent Organic Chemicals (POPs)

These are organic chemicals that are resistant to environmental degradation through chemical, biological, and photolytic processes

Leachate

This refers to any liquid that passes through a landfill and has extracted dissolved and suspended matter from it.

True

TRUE OR FALSE. Store concentrated acids and bases separately in enclosures made of corrosion-resistant materials.

False

TRUE OR FALSE. Keep fire extinguishers away from locations where chemicals are stored or used

Safety Data Sheet

It is a document that provides useful information on the chemical hazards, advice on safe handling, use and storage, and the emergency measures to be followed in case of an accident. It usually contains 16 headings.

Respiratory Sensitizer

Type of chemical that can cause an allergic reaction in the airways following inhalation of the chemical

a. acetic acid solution

Ammonia solution can be stored with the following chemicals except for:

a. acetic acid solution b. sodium hydroxide solution

c. 2-propanol solution d. cyclohexane solution

compatibility with other chemicals

First consideration for chemical storage shall be based on its:

potassium dichromate

Which of the following is an oxidizing chemical?

a. potassium dichromate

b. sodium hydride

c. magnesium

d. sodium

Desiccator

Sealable enclosures containing desiccants used to protect chemicals which are hygroscopic or which react with water from humidity.

b. pycnometer

To determine the specific gravity of a liquid, which of the following glass wares should be used?

a. volumetric flask

b. pycnometer

c. pipette

d. graduated cylinder

fume hood

Preparation of highly toxic and volatile compounds should be carried out in an efficient _____________.

False

TRUE OR FALSE. The conductivity value of a liquid solution increases as the temperature decreases as a result of higher ion mobility.

False

TRUE OR FALSE. The conductivity value of a liquid solution increases as the temperature decreases as a result of higher ion mobility.

True

True or false.The alkaline effect is the phenomenon where H+ ions in the gel layer of the pH-sensitive membrane are partly or completely replaced by alkali ions.

False

TRUE OR FALSE. In pH measurements, if the solution is acidic, the H+ ions diffuse out of the layer and a negative charge is established on the outer side of the membrane.

False

TRUE OR FALSE. Karl Fischer titrator is used to determine viscosity of liquids

True

TRUE OR FALSE. For pipettes marked with To Deliver (TD), a small amount of liquid remaining on the tip should not be blown out.

False

TRUE OR FALSE. Cuvettes must be cleaned in an ultrasonic cleaning bath

True

TRUE OR FALSE. In operating the centrifuge, opposing tubes must be of equal weight

False

TRUE OR FALSE. To ensure that glass wares is properly cleaned, the film of water which adheres to the inner glass wall of the glass ware as it is emptied must not be uniform

False

TRUE OR FALSE. . Class B volumetric glass ware provides the highest accuracy and passes the ASTM standard specification for laboratory volumetric glass ware.

False

TRUE OR FALSE. In calibration of burettes, volume reading shall be taken with the eye higher than the liquid level to avoid parallax error

Hydrochloric Acid

Which of the following chemicals may be used to neutralize waste containing caustic soda?

a. Potassium Hydroxide b. Ammonia

c. Hydrochloric Acid

d. Buffer 10 Solution

chlorine

This chemical is usually used to disinfect waste containing microbial organisms.

Pictogram

Symbols indicated in waste labels that instantly identify the kind of hazard the chemical possesses

Waste containing dichloromethane

Which of the following waste is classified as halogenated waste?

A. Waste containing toluene

B. Waste containing dichloromethane

C. Waste containing acetone

D. Waste containing ammonia

Waste containing acetonitrile

Which of the following waste is classified as non-halogenated waste?

A. Waste containing acetonitrile

B. Waste containing chloroform

C. Waste containing polychlorinated hydrocarbons

D. Waste containing bromine

200 ppm

What is the minimum concentration of cyanide contained in a waste to be classified it under A101( wastes containing cyanide )?

All of the above

According to Revised DAO 04-36, the appropriate waste labels shall include:

A. Volume of Waste

B. Generator ID Number

C. Container Material D. All of the above

Oxidizer

GHS HAZARD SYMBOL: O na may apoy

Environmental Hazard

GHS HAZARD SYMBOL: May puno yung picture and fish

Corrosive

GHS HAZARD SYMBOL: Dalawang test tube na tinapon yung laman in opposite directions

explosive

GHS HAZARD SYMBOL: parang firework

flammable

GHS HAZARD SYMBOL: apoy

harmful

GHS HAZARD SYMBOL: exclamation point

toxic

GHS HAZARD SYMBOL: skull

compressed gas

GHS HAZARD SYMBOL: Cylinder tank pero mukang dinamita

health hazard

GHS HAZARD SYMBOL: tao na may star sa dibdib

Calibration curve

It is a general method for determining the concentration of a substance in an unknown sample by comparing the unknown to a set of standard samples of known concentration.

UV-Vis Spectrophotometer

Which of the following instruments uses a cuvette? Flame- AAS b. UV-Vis Spectrophotometer c. Gas Chromotograph d. pH Mete

. Buffer Solutions

A series of reference standards solutions that have known and accurate pH values at different temperatures used for pH meter calibration.

wavelength

A property of a wave which is described as the distance between a point on one wave and the same point on the next wave.

pH

It is the measure of hydrogen ion activity in aqueous solutions.

Beer-Lambert's Law

Law that states the linear relationship between absorbance and concentration of an absorbing species

Matrix Spike

Type of quality-control sample used to evaluate the effects of sample matrices on the performance of an analytical method

Instrument Blank

A clean sample (e.g., distilled water) processed through the instrumental steps of the measurement process to determine instrument contamination

Method Detection Limit

Minimum concentration of a substance that can be measured and reported with 99% confidence that the analyte concentration is greater than zero

Systematic Error

Component of error which, in the course of a number of analyses of the same measurand, remains constant or varies in a predictable way

Random Error

Component of error which arises from unpredictable variations of influence quantities.

Quality Control

Series of analytical measurements used to assess the quality of the analytical data

Light

Q part of the Atomic Absorption Spectrophotometer that Provides the analytical light line for the element of interest

Nebulizer

Part of AAS that Creates a fine aerosol for introduction into the flame

Flame

part of AAS that Destroys any analyte ions and breakdown complexes to create atoms (the elemental form) of the element of interest.

Monochromator

part of AAS that Separates and transmits a narrow portion of the optical signal chosen from a wider range of wavelengths available at the input.

Detector

part of AAS that Determines the intensity of photons of the analytical line exiting the monochromator.

amber bottle container

Light sensitive samples should be collected in a/an __________ container.

Dichloromethane

A solution consisting of petroleum ether, nhexane and ethyl acetate is subjected to fractional distillation. What compound will be recovered first given the following boiling points? Dichloromethane = 39.6°C, n-hexane = 68°C, Xylene = 140°C.