Authors:M. Wasim, A. Rahman, S. Waheed, M. Daud, and S. Ahmad
Air particulate matter (PM) was collected in two size fractions using stacked filter units (SFUs) provided by the International Atomic Energy Agency (IAEA) from the industrial area of Islamabad. Nucleopore polycarbonate filters were used for collecting from Oct 98 to Jun 99 the particulate matter in coarse and fine size fractions. The samples were characterized by the instrumental neutron activation analysis (INAA). About 33 elements were quantified using different irradiation and counting protocols.
Authors:S. Waheed, N. Siddique, M. Arif, M. Daud, and A. Markwitz
Size fractionated PM2.5 and PM2.5–10 airborne particulates collected from the airport housing society site in Rawalpindi were characterized using the non destructive
ion beam analysis method. Proton induced X-ray emission and Proton induced gamma ray emission were employed to quantify 28
trace elements in fine and coarse filter samples. The average PM2.5 and PM2.5–10 masses were found to be 15.7 and 144 μg/m3, respectively which, when combined exceed the Pakistani limit for PM10 of 100 μg/m3. The average black carbon (BC) content was found to be 3.49 and 5.95 μg/m3 corresponding to 23.8 and 4.30% of the fine and coarse masses, respectively. The reconstructed mass (RCM) was calculated
for both particle modes using 5 pseudo sources, namely soil, sulfate, smoke, sea salt and BC. It was found that 5 sources
could account for 80.6 and 49.0% of the fine and coarse masses, respectively. The low value of RCM for the coarse mode may
imply a much higher organic content. The major sources contributing to the fine mode were soil, sulfate and BC. Similarly
for the coarse mass fraction it was found that soil was the major source whereas the sulfate and BC sources did not contribute
Authors:N. Siddique, S. Waheed, M. Daud, A. Rahman, and S. Ahmad
Tuna fish flesh homogenate, IAEA-436, was received under the IAEA Analytical Quality Control Services (AQCS) intercomparison
programme. Instrumental neutron activation analysis (INAA) was used to determine Al, As, Br, Ca, Ce, Cl, Co, Cr, Cs, Eu, Fe,
Hg, K, Mg, Mn, Na, Rb, Se, Sb, Sm, and Zn in this proposed reference material (RM). IAEA-407 (Fish Homogenate) and NIST-SRM-1572
(Citrus Leaves) were used for quality assurance (QA) purposes. Due to the very low levels of most elements in IAEA-436, large
discrepancies were observed between our results for IAEA-436 and data cited by the IAEA.
Authors:N. Siddique, S. Waheed, M. Daud, A. Markwitz, and P. Hopke
Over a 1,000 pairs of coarse and fine filters were collected using Gent samplers and polycarbonate filters from three sites
in Islamabad from the period 1998 to 2010. The black carbon in these samples was determined by reflectance measurement while
their elemental composition were determined using the techniques of instrumental neutron activation analysis, ion beam analysis
and X-ray fluorescence spectrometry. Islamabad is a well planned and relatively small city as compared to Lahore or Karachi
therefore its air quality is better than the air quality of other major Pakistani cities. It was found that the new air quality
standards being implemented by the Pakistani government on the 1st of January 2012 may not be attained even in Islamabad without
the implementation of control and remedial measures. An overview of the elemental data obtained and calculation of enrichment
factors shows that the particles in Islamabad originate from re-suspended soil, vehicular emissions and coal combustion. However
further work is required for identification of pollution sources and their origin.
Authors:A. Mannan, S. Ahmad, M. Daud, and I. Qureshi
Natural mixture containing mostly minerals of iron, sillicon, magnesium, aluminium and calcium was exploited for the decontamination study of europium radionuclides from aqueous radioactive waste solutions. The physicochemical conditions, such as shaking and equilibration time, nature of hydrogen ions, pH, temperature, concentrations of adsorbate and adsorbent were experimentally determined. This study showed quantitative adsorption beyond pH 7 and under optimized conditions, up to 33 g of the adsorbate can be rapidly removed from radioactive effluents using only 1 kg of the mineral mixture (MM). Desorption study of the solidified radioactive waste product reveals no significant loss (< 0.01% month), indicating MM as an effective material for removal of radioactive europium and storing it in solid form over a long period of time.
Authors:M. Wasim, W. Zafar, M. Tufail, M. Arif, M. Daud, and A. Ahmad
To study the impurity elements, which render color-induced topaz long lived radionuclides, three samples of topaz, from three
different cities of the Northern Pakistan (Baltistan, Gilgit and Mardan) were analyzed using k0 instrumental neutron activation analysis (k0-INAA). The samples were irradiated in Pakistan Research Reactor-1 (PARR-1) and PARR-2 at Pakistan Institute of Nuclear Science
& Technology (PINSTECH), Islamabad. The method was validated by analyzing IAEA-S7 reference material. In three samples a total
of 22 trace level impurity elements were quantified. Among impurities, 10 elements including As, Ce, Ga, Ge, La, Na, Sb, Sc,
U and Zn were common in topaz of all the three places. The storage time has been calculated for each sample required to bring
the induced radioactivity down to permissible level given by US National Regulatory Commission.
Authors:S. Waheed, N. Siddique, M. Arif, I. Fatima, N. Khalid, S. Rahman, M. Daud, and M. Wasim
This paper presents the results of the proficiency test exercise conducted in Pakistan for the determination of trace elements
in mushroom reference material. Thirteen laboratories from different organizations of the country submitted trace elemental
data on Al, As, Br, Ca, Cd, Ce, Cl, Co, Cr, Cs, Cu, Fe, Hg, K, Li, Mg, Mn, Na, P, Pb, Rb Sc, Si, Sm, Sr, Th, Zn. Results for
Al, As, Br, Ca, Cd, Cl, Co, Cr, Cs, Cu, Fe, K, Mg, Mn, Na, Rb Sc, and Zn, in the mushroom material were reported by two or
more participating laboratories and could be subjected to statistical evaluation. The original data of these trace elements
was subjected to a computer program “Histo Version 2.1” provided by IAEA. The four outlier tests, i.e., Dixon, Grubbs, skewness
and kurtosis were applied to the data sets. Consensus (overall) mean values, absolute standard deviation, relative standard
deviation, standard error, median and range of values for these elements have been reported at a significance level of 0.05.